In praise of the colour blue

 

 

The blue-shorts roller-skating club is out training, Taichung, Taiwan. (Photos copyright © by Kaj Halberg)

 

 

 

 

In the wonderful Monterey Aquarium in California, huge aquariums, containing various jellyfish, are brightly illuminated, on a blue background. These pictures show purple-striped jellyfish (Chrysaora colorata) (top) and a species of moon jellyfish (Aurelia). (Photos copyright © by Kaj Halberg)

 

 

 

 

During the large annual fair in Sonpur, Bihar, northern India, people act as a clothesline. The thin cloth will dry in a few minutes in the hot sunshine. (Photo copyright © by Kaj Halberg)

 

 

 

 

Car wash, Taichung, Taiwan. Bluish and pink soap creates patterns on the car door. (Photo copyright © by Kaj Halberg)

 

 

 

 

Swinhoe’s pheasant (Lophura swinhoii), also known as Taiwan blue pheasant, is endemic in the mountains of central Taiwan, where it is quite common. It is named after British biologist Robert Swinhoe (1836-1877) who, in 1860, became the first European consular representative to Taiwan. He discovered many new species, and four mammals and 15 birds are named after him.

To lure this gorgeous bird closer, many Taiwanese photographers strew maize or other food near roads or trails, often causing it to become remarkably tame.

 

 

Male Swinhoe’s pheasant, Dasyueshan National Forest. (Photo copyright © by Kaj Halberg)

 

 

 

 

The marvellous Sultan Ahmed Camii (‘Sultan Ahmed Mosque’), in Istanbul, Turkey, is popularly known as ‘The Blue Mosque’. It was constructed between 1609 and 1616, during the rule of Sultan Ahmed I (1590-1617).

Other pictures, depicting this gorgeous building, may be seen on the pages Religion: Islam, and Dawn.

 

 

Fountain in front of Sultan Ahmed Camii, Istanbul. (Photo copyright © by Kaj Halberg)

 

 

 

 

In the picture below, from Dasyueshan National Forest, Taiwan, a number of bird photographers, all by coincidence clad in blue, are gathered at a tree of the species Idesia polycarpa, whose berries draw birds like a magnet. These berries are shown on the page In praise of the colour red.

 

 

(Photo copyright © by Kaj Halberg)

 

 

 

 

Cinnyris is a genus of sunbirds with about 56 species, widely distributed in Africa and Asia.

The purple sunbird (Cinnyris asiaticus) is common from Oman and southern Iran eastwards across the entire Indian Subcontinent to Southeast Asia. Males may appear all black in bright sunlight, but under good light conditions, at close quarters, the plumage is a brilliant blue-purple iridescence. Females are greenish above and yellowish below.

 

 

 

 

Male purple sunbird, feeding in flowers of a species of lion’s ear, Leonotis nepetifolia, Bagan, Myanmar. (Photos copyright © by Kaj Halberg)

 

 

 

 

This elderly woman, clad in blue, has displayed vegetables for sale at the road side, Amasra, northern Turkey. (Photo copyright © by Kaj Halberg)

 

 

 

 

The pineapple (Ananas comosus), of the family Bromeliaceae, is native to South America, where it has been cultivated for hundreds of years. Today, it is cultivated in warm areas around the world, Hawaii, Costa Rica, Brazil, and the Philippines being the largest producers.

Botanically, the pineapple is an herb, which may grow to 1.5 m tall, sometimes taller. It has a short, stocky stem with tough, waxy, spiny leaves, growing to 1 m long. It produces up to 200 bluish flowers, in cultivation sometimes more. In the wild state, it is pollinated primarily by hummingbirds, sometimes at night by bats. The individual fruits, which are berries, join together to create a multiple fruit, the ‘pineapple’.

The English name stems from 1568, a translation from the French of André Thevet’s The New Found World, where he refers to a fruit, cultivated and eaten by the Tupinambá people, living near modern Rio de Janeiro. He describes the fruit as nanas, a Tupi word meaning ‘excellent fruit’, and that it was made in the manner of a ‘pine apple’.

The Tupi word was adopted by Scottish botanist Philip Miller (1691-1771) as the plant’s generic name in the form Ananas, whereas the specific name comosus is Latin, meaning ‘with many leaves’. (Source: en.wikipedia.org/wiki/Pineapple)

 

 

Flowering pineapple, Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

Golden dewdrop (Duranta erecta) is a small shrub of the vervain family (Verbenaceae), native from Mexico and the Caribbean southwards to Paraguay and Argentina. Elsewhere in warmer countries, it is widely cultivated as an ornamental and has become naturalized in many places. It is regarded as an invasive species in a number of countries, including Australia, China, and South Africa, and on several islands in the Pacific.

Other common names of this plant include pigeon berry and Brazilian skyflower, and in Tonga it is known as mavaetangi (‘tears of departure’), alluding to the fruit, which is a small, globose, yellow or orange berry, to 1 cm across. Unripe berries are toxic and are known to have killed children, dogs and cats. Birds, however, are not harmed by the berries. A picture, depicting the berries, is shown on the page In praise of the colour yellow.

The generic name was given in honour of Italian physician, botanist, and poet Gualdo Tadino (1529-1590), better known as Castore Durante da Gualdo.

 

 

Golden dewdrop is widely cultivated in Taiwan, in this case in Taichung. (Photo copyright © by Kaj Halberg)

 

 

 

 

The fate of many kites! Despite being designed as Superman, this kite ended in a tree. – Taichung Metropolitan Park, Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

Elders (Sambucus) is a genus of about 27 species of smaller trees, shrubs, or large herbs, distributed mainly in temperate and subtropical areas of the Northern Hemisphere, whereas on the Southern Hemisphere they are restricted to parts of Australia and South America.

Previously, this genus was classified as belonging to the elder family (Sambucaceae), but was then moved to the honeysuckle family (Caprifoliaceae). However, recent DNA analyses have revealed that, in fact, it belongs to the moschatel family (Adoxaceae).

The generic name is from the Greek sambuca, the name of an ancient string instrument of Asian origin. The wood of elder was presumably used in its construction. The name elder is derived from the Anglo-Saxon word aeld (’fire’). In those days, the hollow stems of elder were used to kindle a fire.

Blue elder (Sambucus cerulea), formerly often called Mexican elder (S. mexicana), is a deciduous shrub, which can grow to a height of 9 m. In spring, it displays an abundance of butter-yellow flowers, followed by purplish-blue berries in autumn. It grows up to an altitude of 3,000 m, in a variety of habitats, including river valleys, woodlands, and exposed slopes with access to water. It has a very wide distribution, from British Columbia south through much of western United States to north-western Mexico, with scattered occurrence in Oklahoma and Texas.

Many indigenous tribes used the berries of this plant for food, and a number of herbal medicines were produced from the wood, bark, leaves, flowers, and roots. The wood was also used to make pipes and musical instruments, such as flutes and small whistles. A dye was made from the berries.

Some authorities reduce this species to a subspecies of the widespread common elder (S. nigra), described on the page Plants: Plants in folklore and poetry. Other elder species include red elder (S. racemosa), described on the page In praise of the colour red, and Chinese elder (S. javanica), presented on the page In praise of the colour orange.

 

 

Blue elder is named for its whitish-blue berries. These were photographed in Yosemite National Park, Sierra Nevada, California. (Photo copyright © by Kaj Halberg)

 

 

 

 

Blue patterns, painted around a blue door in an abandoned house, Rethymno, Crete. (Photo copyright © by Kaj Halberg)

 

 

 

 

Lasianthus is a genus of about 180 species of tropical and subtropical plants in the bedstraw family (Rubiaceae), varying in size from small shrubs to small trees. They are primarily found in the understory of forests. The core area of the genus is Malaysia and Indonesia with c. 130 species, whereas about 30 species are found in warmer areas elsewhere in Asia, 15 to 20 species in tropical areas of Africa, one in Queensland, Australia, and two in the Neotropics. The fruit is a small drupe, usually blue.

This genus was described by Scottish botanist and physician William Jack (1795-1822), who worked as a surgeon in India, and later in Sumatra, where he died in 1822, presumably of malaria. The generic name is derived from the Greek lasios (‘shaggy’) and anthos (‘flower’), the name given in allusion to the rather shaggy appearance of the flowers of most members of the genus.

Lasianthus fordii is a small shrub, to 2 m tall, which grows in humid, shaded forests at altitudes between 200 and 1,000 m, from southern Japan and China southwards through Southeast Asia and the Philippines to Indonesia and New Guinea.

 

 

Fruits of Lasianthus fordii are a gorgeous shade of blue. – Sun-Moon Lake, Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

Another genus in the bedstraw family with bright blue or purple berries is Coccocypselum, which is native to Central and South America, and the West Indies.

Coccocypselum hirsutum is a creeping herb, distributed from Mexico southwards to Paraguay and southern Brazil. The specific name is derived from the Latin hirtus (‘hairy’ or ‘rough’), alluding to the very hairy appearance of this plant, on stems, leaves, and fruits.

 

 

Bright blue fruits of Coccocypselum hirsutum, Parque Nacional Volcán Arenal, Cordillera de Tilarán, Costa Rica. (Photo copyright © by Kaj Halberg)

 

 

 

 

Artwork, exhibited near the Hoan Kiem Lake, Hanoi, Vietnam. (Photos copyright © by Kaj Halberg)

 

 

 

 

Horsetail fleabane (Erigeron canadensis) is a composite, described in detail on the page Nature: Invasive species. Other pictures, depicting this species, are shown on the page Plants: Urban plant life.

 

 

This horsetail fleabane, about 1.2 m tall, grows along a house wall, consisting of blue metal sheets, Taichung, Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

Primroses, or cowslips, genus Primula, are distributed in temperate areas of the Northern Hemisphere and in Temperate South America. This genus probably originated in the Himalaya, where no less than c. 70 species are found.

The name cowslip is interpreted in various ways. According to some authorities, it is a corruption of the Old English word cuslyppe, meaning ‘cow dung’. This probably refers to the favoured habitat of several primrose species, namely cattle grazing grounds. Others claim that the word is a corruption of cow’s leek, derived from the Anglo-Saxon word leac, meaning ‘plant’.

With its broadly bell-shaped flowers, Primula wollastonii differs significantly from most other species of the genus. It is found in central and eastern Nepal, and southern Tibet, between 3,600 and 4,900 m altitude.

You may read more about primroses on the pages Plants: Primroses, and Plants: Plants in folklore and poetry.

 

 

Primula wollastonii, Gokyo Valley, Khumbu, eastern Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

 

The gorgeous butterfly pea (Clitoria ternatea), also called Asian pigeon-wings or bluebell vine, is a native of the southern Arabian Peninsula and Tropical Asia, and has been widely introduced elsewhere as an ornamental, including Africa, Australia, and America.

It is widely utilized in traditional Ayurvedic medicine for various purposes, including as an anti-depressant, a tranquilizer, and a sedative. In traditional Chinese medicine, it has been used for female diseases due to its similarity to the female reproductive organ – a typical example of the Doctrine of Signatures, whose followers claim that the Great God made all plants, so that humans would recognize the usage of them.

In China, Taiwan, and Southeast Asia, the flowers are used as a natural food colouring.

This plant was first named Lathyrus spectabilis by Swedish naturalist Pehr Forsskål (1732-1763), in Yemen, during the Royal Danish Expedition to Arabia 1761-1767. Later, it was renamed Clitoria ternatea by Forsskål’s mentor, the famous Swedish botanist Carolus Linnaeus (1707-1778), also known as Carl von Linné. Nobody can doubt what he was referring to!

The fascinating, albeit short, life of Pehr Forsskål is related on the page People: Pehr Forsskål – brilliant Swedish scientist.

 

 

Butterfly pea, photographed near Kenting, southern Taiwan (top), and near Mysore, Karnataka, South India. (Photos copyright © by Kaj Halberg)

 

 

 

 

Members of Danainae, a subfamily of the brush-footed butterfly family (Nymphalidae), are popularly known as monarchs, crows, and tigers. One member is the blue glassy tiger (Ideopsis vulgaris) which is distributed from India eastwards to Taiwan, and thence southwards to Indonesia.

 

 

Blue glassy tiger, feeding in flowers of a species of boneset, Eupatorium schimadae, north-eastern Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

Ipomoea is a huge genus of the morning-glory, or bindweed, family (Convolvulaceae), comprising more than 500 species, most of which are twining plants with large, beautiful flowers.

The generic name, from the Greek ip (‘worm’) and hómoia (‘resembling’), was given by Swedish naturalist Carolus Linnaeus (1707-1778), also called Carl von Linné, in allusion to the worm-like movements of the stem, twining around other plants, fences, etc.

The blue morning-glory (Ipomoea nil), also called ivy morning-glory due to the shape of its leaves, is probably native to Mexico or Central America, but has been introduced to most warmer parts of the world, where it has become naturalized in many places. Flowers of this species are various shades of blue, with a white funnel. It can be told from similar species by the base of its calyx, which is hairy.

The morning-glory family is described in detail on the page Plants: Morning-glories and bindweeds.

 

 

This picture is from Taiwan, where a pale blue form of blue morning-glory is very common. (Photo copyright © by Kaj Halberg)

 

 

Blue morning-glory, entwining a species of mugwort (Artemisia), Lower Marsyangdi Valley, central Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

 

Dayflowers (Commelina) is a genus of anywhere between 100 and 170 species, found in tropical and subtropical regions around the world. These plants are called dayflowers due to their flowers, which usually only live for one day.

When Swedish naturalist Carolus Linnaeus (1707-1778), also called Carl von Linné, named the genus, he let the two showy blue petals of Commelina communis represent two Dutch botanists, Jan and Caspar Commelijn, whom he wished to honour.

Jan Commelijn (1629-1692), also known as Johannes Commelinus, became a professor of botany, when many plants were imported from the Cape and Ceylon (today Sri Lanka). He also took part in establishing a botanical garden, named Hortus Botanicus. His nephew Caspar Commelijn (1667-1734) became the director of Amsterdam Botanical Garden. (Source: D.O. Wijnands 1983. The Botany of the Commelins. Rotterdam)

Dayflowers have 3 petals, the upper 2 being bright blue or indigo, whereas the much smaller lower petal is white. Each flower has 6 stamens, 3 upper ones with yellow anthers, which are sterile, and 3 lower ones with white or purple anthers, which are fertile.

Asiatic dayflower (Commelina communis) is native to large parts of eastern Asia, from Ussuriland, south-eastern Russia, southwards through China, Korea, Japan, and Taiwan to the northern part of Southeast Asia and extreme eastern India. It has also been introduced to western Russia, south-eastern Europe, and eastern North America, where it has become invasive in several places.

In Chinese traditional medicine, the dried plant is utilized to treat a number of ailments, including sore throat, colds, oedema, bruises, and limited urination. A near relative, Commelina benghalensis, is eaten as a vegetable in Southeast Asia and Africa.

 

 

Asiatic dayflower, growing along a street in Taichung, Taiwan, adorned with pebbles, which have been painted blue. (Photo copyright © by Kaj Halberg)

 

 

This Asiatic dayflower has sprouted next to a house wall in Taichung. (Photo copyright © by Kaj Halberg)

 

 

 

 

The Tuaregs, also known by various other names, including Kel Tamasheq, Imuhagh, Imazighen, and Itargiyen, are a large group of Berber peoples, living in the western half of the Sahara Desert, southwards to Niger, Mali, and Burkina Faso. The Tuaregs have often been called the Blue People, because they dye their clothes with indigo, which stains their skin.

 

 

I met this Tuareg south of Arlit, Niger. (Photo copyright © by Kaj Halberg)

 

 

 

 

Puya is a genus of large plants of the pineapple family (Bromeliaceae), restricted to the Andes Mountains and mountains of southern Central America.

 

 

Gorgeous blue flowers of Puya coerulea, encountered in Reserva Nacional Rio Clarillo, Chile. (Photo copyright © by Kaj Halberg)

 

 

 

 

Water is sprouting out through numerous tiny holes in this sculpture, erected in front of Silkeborg Art Museum, Jutland, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

 

Since 1975, the major part of larger elms (Ulmus) in Europe and North America have been killed by Dutch Elm disease, caused by the sac fungus Ophiostoma novo-ulmi (formerly Ceratocystis novo-ulmi), which is spread by elm bark beetles of the genera Scolytus and Hylurgopinus. It is generally believed that the disease originated in Asia, but was accidentally introduced to Europe and North America, where most native elm species had no resistance against the disease.

Dutch Elm disease is described in detail on the page Nature Reserve Vorsø: Dutch Elm disease on Vorsø.

 

 

In a silent summer night, these common elms (Ulmus glabra), which have been killed by Dutch elm disease, stretch their dead branches into the bluish sky, Nature Reserve Vorsø, Horsens Fjord, Denmark, (Photo copyright © by Kaj Halberg)

 

 

 

 

Many houses in the town of Taplejung, eastern Nepal, are painted blue. (Photo copyright © by Kaj Halberg)

 

 

 

 

The male grandala (Grandala coelicolor) is a gorgeous bird, whose plumage is an almost iridescent hue of blue, whereas the female is greyish with faint white stripes on head, nape, and breast, and a brownish tinge to the wings.

This species is distributed from Kashmir along the entire Himalayan chain, and thence northwards through eastern Tibet to western China, from northern Yunnan northwards to eastern Qinghai. It breeds at very high altitudes, between 4,000 and 5,500 m, moving to slightly lower elevations in winter.

Classification-wise, this species has been knocked about a great deal. Initially, it was regarded as belonging to the thrush family (Turdidae), but following genetic studies it was then transferred to the flycatcher family (Muscicapidae). However, recently it has been moved back to the thrush family!

 

 

From a stone in a mountain stream in the Gokyo Valley, Khumbu, eastern Nepal, this male grandala would alight and flutter about butterfly-like to snap an insect, before returning to its vantage point. (Photo copyright © by Kaj Halberg)

 

 

 

 

Common viper’s bugloss (Echium vulgare) is native to most of Europe and northern Temperate Asia, and it has also become naturalized in parts of North America.

The generic name is from the Greek echis, meaning ‘viper’, referring to the shape of the flower, with the long, red stamens sticking out like a viper’s tongue. The name bugloss is from the Greek, meaning ‘ox tongue’, referring to the rough surface of the leaves. In Swedish, the name of this species is blåeld, meaning ‘blue fire’, alluding to the wonderful blue colour of the flowers, which, when many plants grow together, does resemble ‘blue fire’.

Formerly, it was believed that this species could be used as a cure for snake bite. British herbalist Nicholas Culpeper (1616-1654) says about this: “It is a most gallant herb of the sun; it is a pity it is no more in use than it is. It is an especial remedy against the biting of the viper, and all other venomous beasts, or serpents; as also against poison, or poisonous herbs. Dioscorides and others say that whosoever shall take of the herb or root before they be bitten, they shall not be hurt by the poison of any serpent.”

Pedanius Dioscorides (died 90 A.D.), was a Greek physician, pharmacologist, and botanist, author of De Materia Medica, five volumes dealing with herbal medicine.

 

 

Common viper’s bugloss, growing abundantly on a gravelly beach on the Swedish island of Gotland. (Photos copyright © by Kaj Halberg)

 

 

Common viper’s bugloss, Bornholm, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

 

The nilgai (Boselaphus tragocamelus) is a large, stout antelope, distributed in the major part of India, and also a small population in southern Nepal.

The name nilgai is Hindi, meaning ‘blue cow’, alluding to the slate-coloured, slightly bluish coat of the male, and to its similarity to the sacred cow. For the latter reason, the nilgai is protected by devout Hindus and has thus escaped the fate of many other animals in India, which are on the brink of extinction, including tiger (Panthera tigris), lion (Panthera leo), and blackbuck (Antilope cervicapra). The coat of females and young males is a pale sandy brown. Both sexes have a white throat patch.

The scientific name of this antelope is quite peculiar. It is derived from four Greek words, bous (‘cow’), elaphos (‘deer’), tragos (‘goat’), and kamelos (‘camel’). The name was applied by Prussian naturalist Peter Simon Pallas (1741-1811), to whom this antelope apparently resembled a mixture of these four animals.

 

 

Nilgai males, drinking from a waterhole, Sariska National Park, Rajasthan, north-western India. (Photos copyright © by Kaj Halberg)

 

 

 

 

The bellflower genus (Campanula) includes more than 500 species, found in temperate and subtropical areas of the Northern Hemisphere, with the highest diversity around the Mediterranean and in the Middle East.

The generic name, as well as the name of the entire family, Campanulaceae, is due to the bell-shaped flowers of this genus, from the Latin campanula (’little bell’).

Four species are presented below, and several others are described on the page Plants: Flora of the Alps.

 

The widespread harebell (Campanula rotundifolia), also known by a number of other names, including bluebell, lady’s thimble, witch’s bells, and witch’s thimbles, has a circumpolar distribution, growing between latitudes 40°N to about 78°N. It is very common in most parts of Europe, where it may be found from the Mediterranean northwards to the Arctic.

 

 

In this picture, harebell grows among red fescue (Festuca rubra) in the Hagestad Nature Reserve, Skåne, Sweden. (Photo copyright © by Kaj Halberg)

 

 

 

Peach-leaved bellflower (Campanula persicifolia) is native to the major part of Europe, excluding the British Isles, eastwards to western Siberia, southwards to North Africa, Turkey, the Caucasus, and Kazakhstan. It has also been introduced to the British Isles, Canada, and the United States, where it sometimes becomes naturalized.

In the northern part of its natural range, this species grows down to sea level, whereas in the southern part it is restricted to mountains. It is found in a wide variety of habitats, including grasslands, broad-leaved forest, and along streams. The specific and popular names were given in allusion to its leaves, which to some degree resemble those of peach (Prunus persica).

 

 

Peach-leaved bellflower, growing on a coastal bluff, northern Zealand, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

Campanula tomentosa, also called C. ephesia, is endemic to western Turkey, mainly growing on the Dilek Peninsula, which juts out into the Aegean Sea. It may also be found among the ruins of the ancient Greek city of Ephesus. The specific name is Latin, meaning ‘covered in rough hairs’, alluding to the dense hair cover on this plant. The alternative name ephesia means ‘from Ephesus’.

 

 

Campanula tomentosa, encountered among the ruins of Ephesus, western Turkey. (Photo copyright © by Kaj Halberg)

 

 

 

The gorgeous great bellflower (Campanula latiloba) is another Turkish endemic, which is restricted to a belt along the Black Sea coast.

 

 

Campanula latiloba, Kapisuyu, near Cide, Black Sea. (Photos copyright © by Kaj Halberg)

 

 

 

Sheep’s-bit (Jasione montana), which also belongs to the bellflower family, is distributed in Temperate Europe and western Asia. It prefers to grow on rather poor soil, including dunes and heathland.

 

 

On the island of Bornholm, Denmark, sheep’s-bit often grows among coastal rocks, in this case together with sweet vernal grass (Anthoxanthum odoratum). (Photo copyright © by Kaj Halberg)

 

 

 

 

Tanagers are a huge American family of passerines, Thraupidae, comprising at least 200 species, of which the majority are found in Mexico, Central America, and South America. Traditionally, about 240 species were included in this family, but, following genetic research, some species have been transferred to the finch family (Fringillidae), others to the cardinal family (Cardinalidae).

 

The blue-grey tanager (Thraupis episcopus) is common in open woodland, gardens, and cultivated areas, from Mexico through Central America southwards to Bolivia and northern Brazil. It is also found on the Caribbean islands Trinidad and Tobago, and has been introduced to Peru, around the capital Lima.

 

 

This blue-grey tanager is feeding on a fallen fruit of great morinda (Morinda citrifolia), Tortuguero National Park, Costa Rica. (Photo copyright © by Kaj Halberg)

 

 

 

The gorgeous red-legged honeycreeper (Cyanerpes cyaneus) is another member of the tanager family, which is distributed from southern Mexico southwards to Peru, Bolivia, and central and eastern Brazil. It is also found on several Caribbean islands, including Trinidad and Tobago, and Cuba.

 

 

Male red-legged honeycreeper, feeding in flowers of blue porterweed (Stachytarpheta frantzii), Cordillera de Tilarán, Costa Rica. (Photo copyright © by Kaj Halberg)

 

 

 

 

In a suburban area in Taichung, Taiwan, a retired soldier has adorned an entire neighbourhood – walls, streets, doors – with colourful paintings. For this reason, the area has been dubbed Tsai Hung Tsun (‘Rainbow Village’). The picture below shows an example of his art. Others are shown on the page Culture: Folk art in Taiwan.

 

 

Taiwan 2013
(Photo copyright © by Kaj Halberg)

 

 

 

 

The white-winged dove (Zenaida asiatica) is a striking bird, displaying crescent-shaped white wing-patches, black flight-feathers, and a bright blue patch of naked skin around the eye. Despite its specific name asiatica, meaning ‘from Asia’, this dove is a New World bird, distributed in south-western United States, Mexico, Central America, and the Caribbean.

Presumably, Swedish naturalist Carolus Linnaeus (1707-1778), also called Carl von Linné, who named this bird Columba asiatica in 1758, was told that the type specimen originated in Asia. The present generic name was introduced in 1838 by French ornithologist Charles Bonaparte (1803-1857), 2nd Prince of Canino and Musignano, in honour of his wife Zénaïde (1801-1854).

There are seven species of smallish doves in this genus, distributed from southern Canada southwards to southern South America.

 

 

USA 1992
White-winged dove, photographed near Tucson, Arizona. (Photo copyright © by Kaj Halberg)

 

 

 

 

The gorgeous waterlilies (Nymphaea) are a genus of about 50 species, widespread around the world. The generic name is derived from the Greek nymphe (’nymph’). According to legend, a water-living nymph was deeply in love with the powerful hero Heracles (in Latin called Hercules), who, however, did not return her love. She languished and died, and from her body rose the beautiful waterlily.

The blue waterlily (Nymphaea caerulea), often popularly called Nile lotus or sacred blue lily-of-the-Nile, is distributed in most of eastern Africa, from Egypt southwards to South Africa.

 

 

An abundance of blue waterlilies cover the surface of a pond near Tanga, northern Tanzania. (Photo copyright © by Kaj Halberg)

 

 

 

 

Construction of the Topkapı Sarayı (‘Topkapi Palace’) in Istanbul, Turkey, began in 1459, ordered by Sultan Mehmed II (1432-1481), commonly known as Mehmed the Conqueror. Originally, this palace was called Yeni Saray (‘New Palace’) to distinguish it from an older palace in the city. The name Topkapı (‘Cannon Gate’) was applied to it in the 19th century. This palace served as seat for Ottoman Sultans for more than 500 years.

 

 

Colourful Chinese tiles, Topkapı Sarayi, Istanbul. (Photos copyright © by Kaj Halberg)

 

 

 

Iznik tiles are decorated ceramics, named after the Turkish city of Iznik, situated just east of the Marmara Sea, where these exquisite ceramics were produced, mainly between the late 1400s and the late 1600s. They were decorated with cobalt blue and other colours under a colourless, transparent lead glaze. (Source: en.wikipedia.org/wiki/Iznik_pottery)

 

 

The man in this picture is reading his newspaper, while waiting for customers in his shop, situated in the Kapalıçarşı (‘Covered Market’), or Büyük Çarşı (‘Grand Bazaar’), Istanbul. His tiles and other ceramics are clearly inspired by the famous Iznik tiles. (Photo copyright © by Kaj Halberg)

 

 

 

Obviously, the paintings on these gas bottles in Istanbul are also inspired by the Iznik tiles. (Photo copyright © by Kaj Halberg)

 

 

 

 

The chaffinch (Fringilla coelebs) breeds all over Europe, with the exception of Iceland and far northern Norway and Russia. It is also found on the Azores, Madeira, and the Canary Islands, in North Africa, Turkey, northern Iran, and western Turkmenistan, and in Russia eastwards to central Siberia. It has also been introduced to New Zealand and South Africa.

The male is a pretty bird, with reddish breast and belly, bluish-grey head and nape, olive-green or brownish back and scapulars, and black wings with two conspicuous white bars. The female is greyish-brown, also with white wing bars. Males of the various subspecies in North Africa and on the Atlantic islands are much more bluish, and some authorities speculate that they might constitute several separate species.

 

 

Chaffinches were introduced to New Zealand in the 1860s, and several times later. Today, it is very common all over the country. This male was encountered at Lake Tikitapu. (Photo copyright © by Kaj Halberg)

 

 

 

On the Canary Islands, another species of chaffinch, the aptly named blue chaffinch (Fringilla teydea), lives in pine forests on the island of Tenerife – and nowhere else.

 

 

Male blue chaffinch, photographed in pine forest on the slopes of the Teide Volcano, Tenerife. (Photo copyright © by Kaj Halberg)

 

 

 

 

The Nilgiri Mountains constitute a part of the Western Ghats, a mountain range, which stretches most of the way along the west coast of India, from Goa southwards to the southern tip of the subcontinent. The highest point in the Nilgiris is Dodabetta (2637 m).

The name Nilgiri is derived from the Tamil nila (’blue’) and kurinji, which is the name of a blue-flowered plant of the acanthus family (Acanthaceae), Phlebophyllum kunthianum, which only blooms at intervals of 12 years, but so profusely that entire mountain slopes become bluish. By the British, nilakurinji was corrupted to nilgiri, which means ’blue hill’ in Hindi, i.e. more or less the same meaning.

Towards the end of the 1800s, a narrow-gauge railway track was constructed, heading out from the small town of Mettupalayam in the state of Tamil Nadu, leading up through the Nilgiri Mountains and terminating at the hill station Ootacamund (Ooty). This steep railway is operated by a small blue steam train, the Nilgiri Mountain Express.

Over a distance of 46 km, the terrain rises from c. 300 to c. 2,200 m altitude, the tracks passing through 16 tunnels, and across 31 larger and c. 200 smaller bridges. The lower mountain slopes are covered in tropical monsoon forest, and this area is full of waterfalls. Above c. 1,400 m, the forest gives way to plantations of tea, pines, and eucalyptus.

 

 

Bluish morning mist envelops a eucalyptus plantation in the Nilgiri Mountains, but, as the text above relates, this is not the reason why these mountains got their name. – Eucalyptus is described on the page Plants: Plants in folklore and poetry. (Photo copyright © by Kaj Halberg)

 

 

In this picture, the Nilgiri Mountain Express is puffing its way up into the Nilgiri Mountains. (Photo copyright © by Kaj Halberg)

 

 

Passengers have disembarked during a break at a tiny mountain station. (Photo copyright © by Kaj Halberg)

 

 

 

 

As its name implies, the Sri Lanka blue magpie (Urocissa ornata), formerly known as Ceylon magpie, is endemic to Sri Lanka. This gorgeous bird of the crow family (Corvidae) is partial to tall, undisturbed, primary forest in the south-western wet zone of the island, from the lowlands up to an altitude of about 2,100 m.

Occasionally, it will visit secondary forest or other disturbed areas, but is still continuously declining due to loss of suitable habitat. Its food mainly consists of frogs, lizards, insects and other invertebrates, and to some degree fruit.

Other members of the crow family are presented on the page Animals: Urban animal life.

 

 

This Sri Lanka blue magpie in Sinharaja Forest Reserve is eating the red outer layer of a palm fruit. (Photos copyright © by Kaj Halberg)

 

 

 

 

The name of borage (Borago officinalis), which has given name to the entire family Boraginaceae, is possibly from the Arabic ʾabū min al-ʿaraq, meaning ‘father of sweat’, which, like the specific name officinalis, refers to the medicinal properties of this species, which are described on the page Plants: Plants in folklore and poetry.

The leaves, which have a cucumber-like smell and taste, are eaten as a vegetable, or used in soups, and leaves and flowers are also excellent in salads.

 

 

Borage is very common on the Greek island of Crete, where these pictures were taken. (Photos copyright © by Kaj Halberg)

 

 

 

 

Redstarts (Phoenicurus) are a genus of birds, belonging to the flycatcher family, Muscicapidae. Formerly, this genus contained 11 members, but following DNA analyses of two species of the genus Rhyacornis and one species of the genus Chaimarrornis, these are now included in Phoenicurus.

Occupying a wide range of habitats, including forest clearings, shrubberies, and villages, the blue-fronted redstart (Phoenicurus frontalis) is the commonest among the 10 species of redstart, which have been encountered in the Himalaya.

 

 

Male blue-fronted redstart, observed in the Annapurna area, central Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

 

Beehives are a very common sight on the Greek island of Crete. These have been painted blue and white – the colours of the Greek national flag. (Photo copyright © by Kaj Halberg)

 

 

 

 

Blue anemones (Hepatica), also called hepatica, liverleaf, or liverwort, were named for their mostly three-lobed leaves, hepatica being derived from the Greek hepar (‘liver’). As the outline of the leaf resembles the human liver, followers of the Doctrine of Signatures claimed that they could be used for treatment of liver disorders. This is not the case, but the plant has been used to treat wounds, as an astringent, and as a diuretic.

This genus of the buttercup family (Ranunculaceae), which is native to Eurasia and eastern North America, has caused much confusion among taxonomists as to the number of species, which varies from 7 to 13, depending on authority. Others treat these plants as members of the genus Anemone, which, together with the genus Pulsatilla, is dealt with in detail on the page Plants: Anemones and pasque flowers.

The genus includes the following species, subspecies, and/or varieties:

Hepatica nobilis var. nobilis (European hepatica, or blue anemone), found from Scandinavia and the Baltic southwards to Italy and the Balkans.

H. pyrenaica = H. nobilis var. pyrenaica (Pyrenean hepatica), distributed in the Pyrenees and northern Spain.

H. transsilvanica (Romanian hepatica), restricted to mountains in Romania.

H. falconeri, found in montane forests of Central Asia.

H. asiatica = H. nobilis var. asiatica, distributed in central and eastern China, Korea, and south-eastern Siberia.

H. henryi, found in central and western China.

H. yamatutai, restricted to Mount Emei Shan, Sichuan Province, China.

H. insularis, occurring in southern Korea.

H. maxima, endemic to Ulleung-do Island, Korea.

H. japonica = H. nobilis var. japonica, found in Japan.

H. pubescens = H. nobilis var. pubescens, occurring in central Honshu, Japan.

H. americana = H. nobilis var. obtusa (round-lobed hepatica), distributed in eastern North America.

H. acutiloba = H. nobilis var. acuta (sharp-lobed hepatica), likewise found in eastern North America.

 

 

Large growth of European hepatica (Hepatica nobilis var. nobilis), Knisa Mosse, Öland, Sweden. (Photos copyright © by Kaj Halberg)

 

 

European hepatica (Hepatica nobilis var. nobilis), eastern Jutland, Denmark. The leaves, which appear later than the flowers, have begun unfolding. (Photo copyright © by Kaj Halberg)

 

 

This round-lobed hepatica (Hepatica americana), encountered in Clement Farm Conservation Area, Massachusetts, United States, has just begun blooming. The leaves are from the previous year. (Photo copyright © by Kaj Halberg)

 

 

 

 

The blue tit (Cyanistes caeruleus), named for its blue crown, wings, and upper tail, is a widespread breeding bird in Europe, from northern Scandinavia southwards to Spain, Italy, Greece, and Turkey, and from the British Isles eastwards to western Iran.

In Siberia and Central Asia, it is replaced by a near relative, the azure tit (C. cyanus), which is a very rare guest in Europe.

The blue tits of northern Africa and the Canary Islands, which were formerly included in C. caeruleus, are now regarded as a separate species, the African blue tit (Cyanistes teneriffae), divided into 6 or 7 subspecies.

 

 

This blue tit is removing small bits of decayed wood from its nesting hole in an elder (Sambucus nigra), Nyord, Møn, Denmark. (Photos copyright © by Kaj Halberg)

 

 

 

 

Blue trumpet-vine (Thunbergia grandiflora), also known as Bengal clock-vine or sky-vine, is a huge climber of the acanthus family (Acanthaceae), growing to a length of 20 m or more. It is native to South and Southeast Asia and China, but has become widely naturalized elsewhere. In parts of Australia, it is regarded as a serious invasive.

In Spanish, this plant is called Emperatriz Eugenia, named for Doña María Eugenia Ignacia Augustina de Palafox y KirkPatrick (1826-1920), wife of French Emperor Napoleon III and known as Eugénie de Montijo in French.

The generic name was given in honour of Swedish botanist and physician Carl Peter Thunberg (1743-1828), a pupil of Carolus Linnaeus (1707-1778), also called Carl von Linné. Thunberg is mainly known for his botanical work in South Africa and Japan.

A near relative of blue trumpet-vine is black-eyed Susan (Thunbergia alata), which is described on the page In praise of the colour yellow.

 

 

Blue trumpet-vine, encountered on Peninsula de Osa, Costa Rica. (Photo copyright © by Kaj Halberg)

 

 

 

 

The theme on the local banner of the Swedish island Öland is identical to the official heraldic coat of arms of the island, dating back to c. 1560: a blue sheet of bunting, depicting a golden stag with red antlers, tongue, and hooves, and wearing a red collar – a symbol of Öland as a royal hunting area.

 

 

Sverige 2015
This Öland banner is fluttering in the wind outside a farm in the village of Gillsätra. (Photo copyright © by Kaj Halberg)

 

 

 

 

The flowerheads of chicory (Cichorium intybus) unfold in the morning, after which they turn, always pointing toward the sun, until around noon, and then they wither. A German name of the plant is Wegwarte (’waiting at the road’). A legend has it that the chicory is a transformed virgin, standing at the road side, looking for her sweetheart, turning this way and that.

Chicory is dealt with in depth on the page Plants: Plants in folklore and poetry.

 

 

Close-up of a flowerhead of chicory with a male long hover fly (Sphaerophoria scripta), Djursland, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

 

Jerdon’s leafbird (Chloropsis jerdoni) is widely distributed in the Indian Subcontinent. The male differs from the female by having a black throat and a blue moustachial stripe. Previously, this bird was regarded as a subspecies of the more widespread blue-winged leafbird (C. cochinchinensis). However, it differs in morphology, lacking the blue flight feathers of the latter.

The specific name commemorates British physician and naturalist Thomas Caverhill Jerdon (1811-1872), who described many birds species in India, several of which are named after him.

 

 

Indien 2003
This male Jerdon’s leafbird was caught in a mistnet to be ringed, near Mysore, Karnataka, South India. (Photo copyright © by Kaj Halberg)

 

 

 

 

The blue pine (Pinus wallichiana) is distributed in montane areas from Afghanistan and the Himalaya eastwards to south-western China. In Nepal, honey dew from aphids living on the needles is eaten as candy.

The specific name was given in honour of Danish physician and botanist Nathaniel Wallich (1786-1854), who studied the Indian and Himalayan flora in the early 1800s. The popular name stems from its needles, which have a bluish tinge.

This species is presented in detail on the page Plants: Plants in folklore and poetry.

 

 

Early in the morning, blue pines stand out as silhouettes against the snow-clad peak of Annapurna II (7,937 m), central Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

 

The black-naped monarch (Hypothymis azurea), of the monarch-flycatcher family (Monarchidae), has a very wide distribution, found in the Indian Subcontinent, Southeast Asia, Malaysia, Indonesia, the Philippines, Southern China, and Taiwan. No less than 23 subspecies have been described.

The male is bright blue with a distinctive black patch on the crown and a narrow black stripe across the throat, while the female is dull-blue with brownish wings, lacking the black markings of the male.

 

 

In Taiwan, the black-naped monarch, subspecies oberholseri, is quite common in forests in lower parts of the country. This male was feeding in a dense growth of trees in a city park in Taichung. (Photos copyright © by Kaj Halberg)

 

 

 

 

Gentians proper, Gentiana, are a huge genus, comprising c. 360 species. Previously, it contained about 635 species, but many authorities, including the Angiosperm Phylogeny Group System (APG), has moved about 23 species to the genus Gentianopsis, popularly called fringed gentians, due to the ciliate margins on the petals, and c. 250 species to the genus Gentianella, called dwarf gentians, in which most members, as opposed to members of Gentiana, are without scales or lobules between the corolla-lobes, whereas some species have hairs or lobes in the throat.

Members of these three genera are distributed almost worldwide, found in Europe, north-western Africa, Asia, the Americas, eastern Australia, and New Zealand. The flowers of most species are various shades of blue, while others are purple, violet, mauve, yellow, white, or, rarely, red. The 4 or 5 petals are usually fused, forming a trumpet-, funnel-, or bell-shaped flower.

The name gentian derives from King Gentius, who ruled in Ancient Illyria 181-168 B.C., and who allegedly discovered the medicinal value of the yellow gentian (Gentiana lutea), described on the page Plants: Plants in folklore and poetry.

The following pictures show various blue gentian species.

 

The marsh gentian (Gentiana pneumonanthe) grows in marshes and moorlands, from southern Scandinavia southwards to Portugal, Spain, Italy, Albania, and Bulgaria, and from Britain eastwards to Russia and the Caucasus. It is the host plant of a species of butterfly, the Alcon blue (Phengaris alcon). Formerly, a blue dye was made from the flowers of this species.

 

 

Marsh gentian, photographed on the Danish island of Fanø. (Photo copyright © by Kaj Halberg)

 

 

 

Clusius’ gentian (Gentiana clusii) is distributed in montane areas of southern Europe, in the Pyrenees, the Alps, the Apennines, the Jura, the Black Mountains, and the Carpathians. It was named after Charles de l’Écluse (1526-1609), also called Carolus Clusius, a Flemish physician and botanist, who was among the first to study the Alpine flora.

 

 

Clusius’ gentian, Col du Bous, Marmolada, Dolomites, Italy. (Photo copyright © by Kaj Halberg)

 

 

 

Trumpet gentian (Gentiana acaulis) is very similar to Clusius’ gentian and has a similar distribution, but as opposed to that species, trumpet gentian has longish, green blotches on the corolla, and it prefers to grow on acid soils, whereas Clusius’ gentian is partial to limestone.

 

 

Trumpet gentian, Vrata Valley, Triglavski National Park, Slovenia. (Photo copyright © by Kaj Halberg)

 

 

 

Spring gentian (Gentiana verna) is one of the most widespread gentians, distributed across western and southern Europe, in Morocco, Turkey, the Caucasus, and north-western Russia, eastwards to Lake Baikal, the Altai Mountains, and north-western Mongolia. It grows in sunny places at medium altitudes, in the Alps up to c. 2,600 m.

 

 

Spring gentian, Grossglockner, Austria. (Photo copyright © by Kaj Halberg)

 

 

 

Short-leaved gentian (Gentiana brachyphylla) is quite similar to spring gentian, but as its name implies, its leaves are very short, only about 1 cm long. This species has a wide distribution in southern Europe, from the Spanish Sierra Nevada and the Pyrenees, eastwards across the Alps to the Carpathians, found at altitudes between 1,800 and 3,100 m.

 

 

Short-leaved gentian, Grossglockner, Austria. Purple saxifrage (Saxifraga oppositifolia) is also seen in the picture. (Photo copyright © by Kaj Halberg)

 

 

 

As its specific name implies, Gentiana ornata is a beautiful species, found in the Himalaya, from central Nepal eastwards to south-western China. Like many gentian species, it is flowering late in the year, from September to November.

 

 

Gentiana ornata, photographed at an altitude of c. 4,200 m, Langtang National Park, central Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

Gentianella moorcroftiana is distributed in the western parts of the Himalaya, from Pakistan eastwards to central Nepal. It is very common in the drier landscapes of Lahaul and Ladakh, northern India.

 

 

Gentianella moorcroftiana, observed near Lake Deepak Tal, Lahaul, India, at an altitude of c. 3,800 m. (Photo copyright © by Kaj Halberg)

 

 

 

The common fringed gentian (Gentianopsis ciliata) is found in southern Europe and western Asia, eastwards to the Caucasus.

 

 

Common fringed gentian, photographed near Col d’Aubisque, Pyrenees, France. (Photo copyright © by Kaj Halberg)

 

 

 

 

Blue Mesa is an area in Petrified Forest National Park, Arizona, which consists of thick layers of grey, blue, purple, and green mudstone, deposited about 220 million years ago.

Other pictures from this area may be seen on the page Nature: Rocks and boulders.

 

 

Blue Mesa, Petrified Forest National Park, Arizona. (Photo copyright © by Kaj Halberg)

 

 

 

 

Cow-wheat (Melampyrum), comprising about 40 species of parasitic plants in the broomrape family (Orobanchaceae), are distributed in arctic and temperate regions of the Northern Hemisphere, southwards to Spain, Turkey, and China, and the Carolinas in America.

The generic name is derived from the Greek melampyron, of melas (‘black’) and pyros (‘wheat’), referring to the black seeds, which somewhat resemble wheat grains. An ancient belief had it that the seeds, when mixed with wheat and ground into flour, tended to make the bread black. In the Middle Ages, it was also believed that the seeds were capable of being converted into wheat, supposedly because of the sudden appearance of these plants among wheat, planted on recently cleared land. Cows and sheep readily eat these plants, hence the name cow-wheat. (Source: M. Grieve, 1931. A Modern Herbal. Jonathan Cape, here taken from botanical.com)

In his Cruydeboeck (herb book), Flemish physician and botanist Rembert Dodoens (1517-1585) tells us that “the seeds of this herb taken in meate or drinke troubleth the braynes, causing headache and drunkennesse.”

Popular names of the wood cow-wheat (Melampyrum nemorosum) include natt-och-dag (‘night-and-day’ in Swedish) and Ivan-da-Marya (‘Ivan-and-Maria’ in Russian), both names referring to its striking inflorescences, with yellow flowers and bright purplish-blue bracts. This species is mainly a plant of eastern Europe, found from Denmark, Germany, and Italy, eastwards to north-western Russia.

 

 

Wood cow-wheat, growing along a hedge on the island of Öland, Sweden. (Photo copyright © by Kaj Halberg)

 

 

 

 

In the past, the white-tailed blue robin (Myiomela leucura) was regarded as belonging to the thrushes, but recent genetic studies have concluded that it is in fact a flycatcher of the family Muscicapidae. It is distributed from the Himalaya eastwards across Southeast Asia, with an isolated population, subspecies montium, in the lower mountains of Taiwan.

This species lives in dense forest and bamboo growths, feeding on the ground. Male and female have a very different plumage, the male being dark blue with pale-blue forehead and wing coverts, and a black tail with a large white spot at the base of each side, while the female is brown with a whitish throat, its tail being similar to that of the male.

 

 

This male white-tailed blue robin was photographed in a dense thicket in Dasyueshan National Forest, central Taiwan. (Photos copyright © by Kaj Halberg)

 

 

 

 

Meconopsis is a genus of gorgeous poppies, comprising about 43 species, almost all of which are found in China and the Himalaya. This attractive genus, popularly called Himalayan poppies, is described on the page Plants: Himalayan flora. Blue petals are found in a number of species, two of which are presented below.

 

Meconopsis simplicifolia is easily identified by its largely undivided leaves. It is distributed from Nepal eastwards to Bhutan and south-eastern Tibet, growing in shrubberies and grassy areas at elevations between 3,300 og 5,300 m.

 

 

Meconopsis simplicifolia, Dole, Gokyo Valley, Khumbu, eastern Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

Meconopsis aculeata is found at elevations between 3,000 and 4,200 m, from Pakistan eastwards to Uttarakhand, northern India, and extreme south-western Tibet.

 

 

Meconopsis aculeata, Great Himalayan National Park, Himachal Pradesh, India. (Photo copyright © by Kaj Halberg)

 

 

 

 

Rollers, genus Coracias, are 8 species of colourful birds, which display bright blue or turquoise on various parts of their body. They are often perched on a prominent branch, or a fence post, scanning the surrounding landscape for prey, which includes various invertebrates, and small vertebrates like lizards, snakes, frogs, rodents, and young birds.

The majority of these birds live in sub-Saharan Africa, with one species in Europe and western Asia, one widespread Asian species, and one restricted to Sulawesi.

 

The Eurasian roller (Coracias garrulus) breeds in eastern Europe and south-western Asia, with a disjunctive population in extreme southern France, Spain, Portugal, and north-western Africa. The winter months are spent in Africa, the Iberian and North African populations migrating to West Africa, from Sierra Leone eastwards to Cameroun, whereas eastern populations migrate to southern Africa.

This species has declined rather drastically in most of its breeding area. Threats include hunting during migration, especially in Oman, where thousands are killed for food. In many places, trees have been removed, giving way to modern agricultural practices, robbing the roller of potential nesting sites and perches for hunting, while pesticides have reduced its food sources.

 

 

Eurasian roller, photographed in Tarangire National Park, Tanzania, in early April, when the north-going migration of this species takes place. (Photo copyright © by Kaj Halberg)

 

 

 

The Indian roller (Coracias benghalensis) has a wide distribution, from Iraq and the Arab Emirates, eastwards along coastal Iran and the entire Indian Subcontinent, including Sri Lanka and the Maldive Islands, to Southeast Asia. It is very common in India, where several states have chosen it as their state bird.

 

 

A gorgeous Indian roller, taking off from a thicket in Yala National Park, Sri Lanka. (Photos copyright © by Kaj Halberg)

 

 

 

The lilac-breasted roller (Coracias caudatus) is rather common in open woodland and savanna in eastern and southern Africa, from Ethiopia southwards to South Africa, and thence westwards to Namibia. It is easily identified by its lilac breast.

 

 

In this picture from Kruger National Park, South Africa, a gust of wind ruffles the plumage of a lilac-breasted roller. (Photo copyright © by Kaj Halberg)

 

 

A male lilac-breasted roller brings food to his mate, who greets him by calling, Lake Bogoria, Kenya. (Photo copyright © by Kaj Halberg)

 

 

 

The Abyssinian roller (Coracias abyssinicus) breeds across the African Sahel zone, southwards to Cameroun, Central African Republic, northern Zaire, northern Uganda, and northern Kenya, and is also found along the southern Red Sea coast on the Arabian Peninsula, and along the Nile River, almost to the Egyptian border. Its outer tail feathers are very long and thin.

 

 

Abyssinian roller, Waza National Park, Cameroun. (Photo copyright © by Kaj Halberg)

 

 

 

The purple, or rufous-crowned, roller (Coracias naevius) is much less colourful than the other rollers of this genus, as the blue colour is restricted to wings and tail, and only observed in flight. This bird is very widespread in sub-Saharan Africa, excepting the West African rainforest belt and extreme southern Africa. Its preferred habitat is dry savanna, and its breeding season varies from place to place, possibly linked to recent rains.

 

 

Purple roller, Lake Bogoria, Kenya. (Photo copyright © by Kaj Halberg)

 

 

 

 

Condensed exhaust from a jet plane draws white lines across a bright blue sky behind smoking chimneys of a fish smokehouse, Hasle, Bornholm, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

 

Out of 21 shrubs of the genus Vaccinium, known as blueberries, 20 are indigenous to North America, one of which, the European blueberry (V. myrtillus), also known as common bilberry, is also found on acidic soils in parts of northern Asia and in the major part of Europe. The remaining species, the Korean blueberry (V. koreanum), is restricted to Korea and the neighbouring Liaoning Province of China.

 

 

Picking delicious blueberries is a popular pastime in many parts of the world, in this case European blueberry. – Jutland, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

 

Pittas are colourful birds of Asia, Australia, and Africa, constituting a separate family, Pittidae, with 40-42 species, divided into 3 genera, Pitta, Erythropitta, and Hydrornis. They belong to a clade of passerines, called suboscines, which differ from the true songbirds, the oscines, in the syrinx musculature, making their song less varied than that of the oscines.

The gorgeous African pitta (Pitta angolensis) breeds in tropical forest in several areas of West Africa and in south-eastern Africa, from central Tanzania southwards to Mozambique. The south-eastern populations are migratory, spending the southern winter in countries further north, including Uganda, Kenya, and the Central African Republic.

 

 

Bright blue rump feathers of an African pitta, Rondo Forest, southern Tanzania. (Photo copyright © by Kaj Halberg)

 

 

 

 

Gossamer-winged butterflies (Lycaenidae) is a very large butterfly family with over 4,500 species worldwide, constituting more than 20% of all known butterfly species (excluding moths). Traditionally, the family is divided into a number of subfamilies, of which the blues (Polyommatinae), is the largest.

 

The common blue (Polyommatus icarus) is probably the commonest species of blue in Europe, although it has been declining in later years. It is found from western Europe and North Africa eastwards across the Middle East, southern Siberia, and Central Asia to northern China. Recently, it has expanded its range to include Canada, where it is rapidly spreading. It may have arrived as a ‘blind passenger’ on board a ship.

 

 

Male common blue, feeding in thrift flowers (Armeria maritima), Fanø, Denmark. A hovering fly is seen in the foreground. (Photo copyright © by Kaj Halberg)

 

 

 

The chalkhill blue (Lysandra coridon) is widely distributed in Europe, although absent from the northernmost and southernmost areas. It is also found in Asia Minor and in Russia, eastwards to the Ural Mountains.

The popular name alludes to the fact that it mainly occurs in grassy areas, where the soil is rich in chalk.

 

 

Male chalkhill blue, St. Martin, Pyrenees, Navarra, Spain. (Photo copyright © by Kaj Halberg)

 

 

 

The common tit (Hypolycaena erylus) is found from the Indian Subcontinent and Southeast Asia southwards through the Indonesian Archipelago to the Philippines and several islands in the western Pacific. It may be identified by the two ‘tails’ on the hindwing, up to 6 mm long.

 

 

This common tit (Hypolycaena erylus), encountered at Ta Prohm, Angkor Wat, Cambodia, is sucking sweat from my finger. (Photo copyright © by Kaj Halberg)

 

 

 

 

The great Buddhist Bodhnath Stupa, Kathmandu, Nepal, is always adorned with numerous Tibetan prayer flags, on which mantras are printed. These flags are placed in the following order: blue, white, red, green, and yellow. When they flutter in the wind, the mantras are dispersed into space, for the benefit of humankind.

You may read more about stupas, prayer flags, and other aspects of Buddhism on the page Religion: Buddhism.

 

 

From the great Bodhnath Stupa in Kathmandu, Nepal, the all-seeing, blue eyes of the Buddha survey the surroundings. (Photo copyright © by Kaj Halberg)

 

 

 

 

The narrow-leaved, or cowslip lungwort (Pulmonaria angustifolia), is similar to the widespread common lungwort (P. officinalis), but has narrower leaves and sky-blue flowers. It is native to central and eastern Europe, but is nowhere common.

 

 

Narrow-leaved lungwort, photographed in Denmark, where it is extremely rare, growing on a single coastal bluff in northern Zealand. (Photo copyright © by Kaj Halberg)

 

 

 

 

Manhattan, New York City, by night, seen from Brooklyn Bridge. – To commemorate the Twin Towers of the World Trade Center, which were destroyed during a terrorist attack on September 11, 2001, two blue laser beams are cast into the air, six months later, on the original location of the towers.

 

 

(Photo copyright © by Kaj Halberg)

 

 

 

 

Phacelia, commonly known as scorpionweed or heliotrope, is a genus of the borage family (Boraginaceae), which was traditionally placed in the waterleaf family (Hydrophyllaceae). However, the latest genetic research has reduced this family to a subfamily, Hydrophylloideae, of the borage family. The genus, comprising about 200 species, is native to the Americas. In California alone, more than 90 species have been encountered.

Desert bells (Phacelia campanularia) is a gorgeous plant, which is restricted to the Mojave and Sonoran Deserts in California. It is commonly cultivated as an ornamental elsewhere and may sometimes escape.

The stem, growing to 70 cm tall, is covered in glandular hairs. The leaves are round in outline, with numerous large teeth along the margin. The bright blue, bell- or funnel-shaped corolla, may grow up to 4 cm long, with long, protruding stamens and style.

If the winter has brought ample rain, thousands of these plants will bloom, forming deep-blue masses.

 

 

Desert bells, subspecies vasiformis, Joshua Tree National Park, California. (Photos copyright © by Kaj Halberg)

 

 

 

 

Gaily coloured houses, Valparaiso, Chile. (Photo copyright © by Kaj Halberg)

 

 

 

 

Iris is a genus of wonderful plants, comprising 250-300 species. They are named after Iris, the Greek goddess of the rainbow, presumably because of their colourful flowers.

Several species of this attractive genus are presented on the page Plants: Himalayan flora.

 

 

Some American species of Iris are called ‘flag’, including northern blue flag (Iris versicolor), here photographed in Pawtuckaway State Park, New Hampshire. (Photo copyright © by Kaj Halberg)

 

 

 

 

In former days, bluestarts, or bush-robins, were regarded as small thrushes, but recent DNA analyses have revealed that they are in fact ground-living flycatchers of the family Muscicapidae.

Previously, the Himalayan bluestart (Tarsiger rufilatus) was regarded as a subspecies of the widespread common bluestart (T. cyanurus), but today most authorities consider it a separate species.

 

 

Male Himalayan bluestart, Sagarmatha National Park, Khumbu, eastern Nepal. (Photo copyright © by Kaj Halberg)

 

 

 

 

The five-striped blue-tailed skink (Plestiodon elegans) is distributed in southern China, Vietnam, Taiwan, and the southernmost islands in Japan.

 

 

Immature five-striped blue-tailed skink, photographed on Bagua Shan, western Taiwan. Adults do not have a blue tail. (Photo copyright © by Kaj Halberg)

 

 

 

 

Schizanthus hookerii is a beautiful plant of the nightshade family (Solanaceae), also called butterfly flower, fringe flower, and poor man’s orchid. The flowers of this genus, which is native to Chile and Argentina, are pollinated by bees, bumblebees, and wasps.

 

 

Schizanthus hookerii, Reserva Nacional Altos de Lircay, Chile. (Photo copyright © by Kaj Halberg)

 

 

 

 

Neither of the two North American ‘blue’ herons, the great blue (Ardea herodias) and the little blue (Egretta caerulea), are really blue, but have a bluish tinge to their plumage. Both are widely distributed, the great blue from Alaska southwards to extreme north-western South America. In North America, the little blue is restricted to the United States east of the Rockies, but is found further south than the great blue, southwards to Peru and Brazil.

Many more heron species are presented on the pages Fishing, and Animals – Birds: Birds in Taiwan.

 

 

Great blue heron, Coon Bluff, Salt River, Arizona. (Photo copyright © by Kaj Halberg)

 

 

Great blue heron, feeding on a grassy plain in Ronald W. Caspers Wilderness Park, Santa Ana Mountains, California. (Photo copyright © by Kaj Halberg)

 

 

Little blue heron, Everglades National Park, Florida. (Photo copyright © by Kaj Halberg)

 

 

 

 

Stachytarpheta is a genus of about 125 species of shrubby herbs of the vervain family (Verbenaceae).

Jamaica vervain (S. jamaicensis), also known by many other names, including blue porterweed, blue snakeweed, bastard vervain, and Brazilian tea, is native from south-eastern United States and Mexico southwards through Central America and the Caribbean to Ecuador and northern Brazil. However, it has been introduced to many other parts of the world and has become naturalized in numerous areas.

This plant is found from sea level to an altitude of about 900 m, growing in open areas, including beaches, along roads, and in fallow fields. It is used medicinally as a cooling agent and blood cleanser, and has also been utilized for treatment of asthma and stomach ulcers.

 

 

This Jamaica vervain is making its way up through a fern leaf, near Nanzen Lake, Kenting National Park, Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

The Blue Nile originates in Lake Tana in the Ethiopian Highlands, from where it makes its way c. 1,500 km to Khartoum, in the Sudan, where it joins the larger White Nile.

The name Blue Nile is in fact a misnomer. During the summer monsoon, this river washes down huge amounts of soil from the highlands, which turns its water almost black. In a local Sudanese language, the word for black is also used for blue, so, in reality, the river should be called ‘The Black Nile’.

The first written account of the Blue Nile is from 1565, when a Portuguese, João Bermudes, who called himself Patriarch of Ethiopia, provided a description of the Blue Nile Falls, Tississat, in his memoirs.

Incidentally, to many Christian Ethiopians, the Blue Nile is identified as the sacred river Gihon, one of the four rivers flowing out from the Garden of Eden, as related in Genesis, 2:13.

 

 

The great Tississat Falls on the Blue Nile, Ethiopia. (Photos copyright © by Kaj Halberg)

 

 

 

 

Baby blue-eyes (Nemophila menziesii) is a gorgeous member of the forget-me-not family (Boraginaceae), native to near-coastal areas of western United States and Mexico, from Oregon southwards to Baja California. This plant is widely cultivated as an ornamental and comes in many colour varieties.

The specific name was given in honour of Scottish naturalist Archibald Menzies (1754-1842), who participated in an expedition around the world, as surgeon and botanist, on board HMS Discovery, under the leadership of Captain George Vancouver (1757-1798).

 

 

Baby blue-eyes, Ronald W. Caspers Wilderness Park, Santa Ana Mountains, California. (Photo copyright © by Kaj Halberg)

 

 

 

 

The city of Jodhpur, Rajasthan, north-western India, was founded in 1459 by Rajput Prince Rao Jodha. The Old Town is aptly called ‘The Blue City’, as most of its houses are painted a light blue. Originally, these blue houses were inhabited by Brahmins, and their colour indicated that here you could ask advice about disease as well as religious issues. Furthermore, the blue paint contains copper oxides, which keep termites at bay.

 

 

Blue houses in Jodhpur. (Photos copyright © by Kaj Halberg)

 

 

 

 

Bluewing, or wishbone flower (Torenia violacea), is a pretty plant of the family Linderniaceae. This species has a very wide distribution in warmer parts of Asia, from India eastwards to southern China and Taiwan, and thence southwards to Indonesia.

 

 

Bluewing is very common on the lower mountain slopes in Taiwan, where these pictures were taken. (Photos copyright © by Kaj Halberg)

 

 

 

 

Lahaul-Ladakh 2014
The bright blue T-shirt of this salesman in Pandoh, Himachal Pradesh, northern India, stands out against the subtler colours of the vegetables and fruits around him, including bananas, tomatoes, cucumbers, cabbages, eggplants, and potatoes. (Photo copyright © by Kaj Halberg)

 

 

 

 

Larkspurs (Delphinium) are a genus in the buttercup family (Ranunculaceae), identified by their irregular flowers, which have five coloured sepals, the upper one with a large, back-pointing spur, and four inner petals, of which the upper two have nectar-producing spurs that are enclosed in the larger spur.

Several larkspur species are presented on the page Plants: Himalayan flora.

 

 

A large growth of the dark-blue Delphinium kamaonense, Langtang National Park, Nepal. A species of aster is also seen. (Photo copyright © by Kaj Halberg)

 

 

 

 

This fishing vessel is in dock, to be furnished with new paint, Wushe Fishing Harbour, north-eastern Taiwan. (Photo copyright © by Kaj Halberg)

 

 

 

 

Popular names of the genus Myosotis, comprising about 74 species, include forget-me-not and scorpion grass. The large majority of the species have pale-blue flowers.

The name forget-me-not arose from a French legend. A knight was walking along a river with his lady, when he noticed some beautiful blue flowers, growing at the waterside. When he bent down to pick them, his heavy armor caused him to lose his balance, and he fell into the water, where the armour dragged him below the surface. Before disappearing, he managed to toss the flowers to his lady, shouting “Ne m’oubliez pas!”

This sentence became the French name of the flower, which was translated into several other languages, including forget-me-not in English, first used by King Henry IV in 1398.

 

 

Water forget-me-not (Myosotis scorpioides), photographed on the island of Zealand, Denmark. (Photo copyright © by Kaj Halberg)

 

 

 

(Uploaded March 2017)

 

(Latest update March 2021)