Author

GP Jürgens

Symplocaceae

Symplocos glomerata

by GP Jürgens

King ex C.B. Clarke

Bhutan2014 793
Bhutan
Sikkim2004 94 P164
Sikkim West-Bengal, Bersay 2700m April
Sikkim2004 329 P530
Sikkim West-Bengal, Bersay 2700m April

Description

Symplocos glomerata is an Asian tree distributed from the Himalaya and northern India through Bhutan, Nepal and Myanmar into southern China, Taiwan, Indochina and the Malesian region. Its 572 GBIF records span this broad range, indicating a widespread but locally distributed species of evergreen and mixed montane forest. It grows in broadleaved and laurel-dominated forests, on slopes and ridges, typically in the warm-temperate to lower-subtropical montane belt. The plant photographed at Bersay in the Sikkim-West Bengal border region at about 2700 m in April illustrates its occurrence in the moist mid-elevation forests of the Eastern Himalaya, flowering in early spring.

It is a small evergreen tree or shrub with leathery, alternate leaves that are elliptic to oblong, with serrate to crenate margins and a glabrous, glossy upper surface. The flowers are borne in dense, sessile, glomerate clusters in the leaf axils, as the epithet glomerata indicates; each is small, white and fragrant, with a five-lobed corolla and numerous stamens united at the base in fascicles, a characteristic of the genus. The fruit is a small, ovoid to cylindric drupe crowned by the persistent calyx lobes.

Symplocos is the sole genus of the Symplocaceae, distinguished by its polyandrous flowers and aluminium-accumulating tissues; several species, including this one, have been used to yield yellow dyes and mordants. S. glomerata varies considerably across its wide range and has accumulated numerous synonyms and infraspecific names. Widely distributed and ecologically tolerant, it is not regarded as threatened and is a common constituent of Asian montane forest.

Author: King ex C.B. Clarke · Sources: POWO (Kew), GBIF, Flora of Bhutan, Flora of China, Nooteboom Symplocaceae monograph

Symplocaceae

Symplocos lucida

by GP Jürgens

Siebold & Zucc.

Bhutan2015 531
Bhutan Phobjika 2450m, October
Bhutan2015 529
Bhutan Phobjika 2450m, October

Description

Symplocos lucida is a broadly distributed evergreen of eastern and southern Asia, occurring from China, Japan, Korea and Taiwan through Hong Kong, the Philippines, Vietnam, Thailand, Malaysia and Indonesia to the Himalayan countries of Nepal, India and Bhutan; its more than 413 GBIF records reflect this wide range, with the United States accessions cultivated or herbarium-based. It grows in evergreen broad-leaved and mixed mid-montane forests, on forest margins and shrubby slopes, generally between about 1500 and 2800 m. The photographed tree at Phobjika in central Bhutan at 2450 m in October illustrates its occurrence in cool, humid temperate forest of the eastern Himalaya.

It is an evergreen shrub or small tree with smooth grey bark and glabrous young shoots. The alternate, leathery leaves are elliptic to oblong-lanceolate, glossy (whence lucida) and dark green above, with a serrate to crenate margin and a short petiole. The flowers are small, white and fragrant, borne in short axillary spikes or racemes; each has a five-lobed calyx and corolla and numerous stamens fused in fascicles at the base. The fruit is a small, ovoid to oblong drupe, dark blue-black or purplish when ripe, crowned by the persistent calyx and enclosing a single hard stone.

Symplocos is the sole genus of the Symplocaceae, a pantropical to warm-temperate family of some hundreds of species centred on Asia. S. lucida belongs to a taxonomically complex aggregate, and its leaves and bark have a long history of use as a mordant (aluminium-accumulating) source in natural dyeing. Widespread and ecologically plastic, it is not considered threatened, though its forest habitats face regional pressure from logging and land conversion.

Author: Siebold & Zucc. · Sources: POWO (Kew), GBIF, Flora of China, Flora of Bhutan, Flora of Japan, Symplocaceae revision (Nooteboom monograph)

Symplocaceae

Symplocos paniculata

by GP Jürgens

Miq.

Bhutan2014 663
Bhutan Phobjika 2250m, May
Bhutan2014 664
Bhutan Phobjika 2250m, May
Bh2008 58 P96
Bhutan Punakha 2400m, April

Description

Symplocos paniculata is a widely distributed eastern Asian shrub or small tree ranging from the Himalaya (Nepal, Bhutan, northeast India) across China, Taiwan, Korea and Japan, with extensive cultivated and naturalised records elsewhere; GBIF documents 9858 occurrences spanning these and many other countries. In the Himalaya it grows in temperate broad-leaved and mixed forests, forest margins, scrub and open hillsides, generally between about 1500 and 2800 m. The photographed plants from Phobjika in Bhutan at 2250 m in May and from Punakha at 2400 m in April show it flowering in spring, when the white, fragrant blossoms appear ahead of full leaf expansion in the temperate Bhutanese valleys.

It is a deciduous shrub or small tree with grey, often lenticellate bark and finely pubescent young twigs. The alternate leaves are elliptic to obovate, acuminate, with a serrulate to crenate-serrate margin and pinnate venation. The fragrant white flowers are borne in terminal and axillary panicles; each flower has a five-lobed calyx, a deeply five-parted corolla and numerous stamens that are basally connate into fascicles, giving the inflorescence a feathery appearance. The fruit is a small ovoid to ellipsoid drupe ripening blue-black to deep blue, crowned by the persistent calyx and containing a single hard stone.

The species belongs to Symplocos, the sole genus of the family Symplocaceae, a group of Old and New World woody plants noted for accumulating aluminium and historically valued as mordant ("sapphire-berry") plants whose bark and leaves were used in dyeing. The blue, lipid-rich drupes are dispersed by frugivorous birds. Common, ecologically tolerant and widely planted as an ornamental, S. paniculata is of least conservation concern across its extensive natural range.

Author: Miq. · Sources: POWO (Kew), GBIF, Flora of China Vol. 15, Flora of Bhutan Vol. 2, Flora of Nepal, Revision of the Asiatic Symplocaceae (Nooteboom)

Symplocaceae

Symplocos ramosissima

by GP Jürgens

Wall. ex G. Don

Garh 07 236 ergebnis
India Garhwal Barron Chatti 2450m, June
Garh 07 237 ergebnis
India Garhwal Barron Chatti 2450m, June

Description

Symplocos ramosissima is an evergreen shrub or small tree widely distributed through the Sino-Himalayan and Indochinese region, with GBIF recording around 1472 occurrences across China, Nepal, India, Myanmar, Bhutan, Bangladesh, Vietnam, Sri Lanka and Taiwan. It is a characteristic component of moist broad-leaved evergreen and mixed temperate forests, occurring on humid slopes, ridge forests and forest margins generally between 1500 and 3000 m. The individual photographed at Barron Chatti in Garhwal, India, at about 2450 m in June sits within this mid-montane band, where the species forms part of the dense understorey and lower-canopy layer of laurel-oak and rhododendron-rich forests on the southern Himalayan flank.

Morphologically it is a much-branched evergreen with glabrous or finely pubescent young twigs and alternate, simple, coriaceous leaves; the blades are elliptic to lanceolate, with a serrate to crenate-serrate margin and an acuminate apex. The flowers are small, white, fragrant and borne in short axillary spikes or racemes, each with a persistent calyx, a rotate to shortly campanulate corolla of five lobes and numerous stamens fused into fascicles at the base, the pollination biology favouring small generalist insects. The fruit is a small ovoid to cylindric drupe, blue-black to purplish when ripe, crowned by the persistent calyx lobes and containing a hard stone, dispersed largely by frugivorous birds.

The family Symplocaceae comprises the single large genus Symplocos, a taxonomically intricate group well represented in the Himalaya and East Asia. The genus is notable for accumulating aluminium and for the yellow dye historically obtained from the bark and leaves of several species, which were used as mordants in traditional textile dyeing. As a common and ecologically wide-ranging forest element, S. ramosissima is not considered threatened, though its dependence on intact mid-elevation evergreen forest links its local persistence to the conservation of those increasingly fragmented montane habitats.

Author: Wall. ex G. Don · Sources: POWO (Kew), GBIF, Flora of China Vol. 15, Flora of Bhutan Vol. 2, Flora of Nepal, Nooteboom Revision of Symplocaceae of the Old World

Symplocaceae

Symplocos sumuntia

by GP Jürgens

Buch.-Ham. ex D. Don

Bh2008 155 P254
Bhutan Phobjika 2650m, April

Description

Symplocos sumuntia is a broadly distributed East Asian and Himalayan tree, recorded from Nepal, north-east India, Bhutan and Bangladesh eastward through China, Taiwan, Japan and Korea to Indochina and Myanmar, with thousands of catalogued occurrences spanning this wide range. It is a constituent of broadleaved evergreen and mixed montane forests, occurring on slopes, ridges and forest margins from the warm subtropical lowlands to the cool temperate belt, broadly between about 800 and 2,800 m. The tree photographed at Phobjika in central Bhutan at 2,650 m in April was recorded in flower, the white blossom opening in spring before or with the new foliage.

It is an evergreen shrub or small to medium tree with smooth grey bark and slender, often glabrous twigs. The leaves are alternate, simple, coriaceous, narrowly elliptic to lanceolate, acuminate, with finely serrate to subentire margins and an entire to undulate texture. The flowers are small, white and fragrant, borne in short axillary racemes or panicles; the corolla is five-lobed, the numerous stamens united at the base into fascicles adnate to the corolla, a hallmark of the family. The fruit is an ovoid to ellipsoidal drupe crowned by the persistent calyx, ripening blue-black to purple.

Symplocos, the sole genus of Symplocaceae, is taxonomically complex, and S. sumuntia (Buch.-Ham. ex D. Don) has historically encompassed numerous regional variants and synonyms. The leaves and bark are valued locally as a source of mordant (aluminium-accumulating tissues used in dyeing) and in traditional medicine. As a widespread forest species it is not of conservation concern, though it depends on the integrity of subtropical montane forest.

Author: Buch.-Ham. ex D. Don · Sources: POWO (Kew), Flora of China Vol. 15, Flora of Bhutan Vol. 2, GBIF, Nooteboom: Revision of Symplocaceae (1975)

Apocynaceae

Tabernaemontana divaricata

by GP Jürgens

(L.) R.Br. ex Roem. & Schult.

Bhutan2014 64
Bhutan Trashigang 1250m, May
Bhutan2012 732
Bhutan Galephu 550m, October
Bhutan2012 736
Bhutan Galephu 550m, October

Description

Tabernaemontana divaricata is a shrub of tropical and subtropical Asia, native to the Indian subcontinent and Southeast Asia and now pantropically cultivated and naturalised; GBIF records over 6500 occurrences across countries including India, China, Thailand, Sri Lanka, Bangladesh, Malaysia, Vietnam, the Philippines and many introduced ranges in the Americas and Pacific. In Bhutan it was photographed at Trashigang at 1250 m in May and at Galephu at 550 m in October, reflecting its occurrence in warm foothill forests, scrub and village surrounds, where it is also widely planted as the ornamental "crape jasmine."

It is a glabrous, evergreen shrub with dichotomously branched (divaricate) stems exuding copious white latex when cut. The leaves are opposite, simple, elliptic to oblanceolate, glossy dark green, with a tapering apex and prominent lateral venation. The flowers are borne in few-flowered terminal or axillary cymes; each is salverform with a slender tube and five contorted, white, often pinwheel-twisted lobes, fragrant especially at night, and cultivated double-flowered forms are common. The fruit is a paired (often divaricate) follicle, somewhat curved and ridged, splitting to expose seeds embedded in a bright orange-red fleshy aril.

The species belongs to the Apocynaceae (subfamily Rauvolfioideae) and, like its relatives, is rich in indole and monoterpene alkaloids that underpin its use in traditional medicine and account for its toxicity. Long cultivated, it has accumulated many synonyms and horticultural forms. It is not threatened, being abundant in cultivation and naturalising readily; its presence in lowland Bhutan marks the subtropical Himalayan margin of a broadly Indomalayan range.

Author: (L.) R.Br. ex Roem. & Schult. · Sources: POWO (Kew), GBIF, Flora of Bhutan, Flora of China, Flora of British India, revision of Tabernaemontana (Leeuwenberg)

Asteraceae

Tagetes minuta

by GP Jürgens

L.

Bhutan2015 523
Bhutan Phobjika 2410m, October

Description

Tagetes minuta L. is native to the temperate grasslands and lower Andes of southern South America but is now a pantropical and warm-temperate weed; GBIF lists over 16,000 occurrences spanning Argentina, Bolivia, Brazil, Ecuador, the United States, Spain, France, Belgium, the Netherlands, South Africa, Kenya, Tanzania, Namibia, Zimbabwe, Ethiopia, India, Korea, Saudi Arabia and Australia. It is a ruderal colonist of cultivated ground, roadsides, waste places and field margins. The record from Phobjika at 2410 m in October shows its naturalisation in the Bhutan Himalaya, where it flowers late in the season on disturbed and abandoned ground.

It is a tall erect annual herb reaching well over a metre, with a strongly aromatic, glandular-punctate foliage. The stems are ribbed and branched above; the leaves are opposite below and alternate above, pinnately divided into numerous lanceolate, sharply serrate leaflets dotted with conspicuous oil glands. The small, narrow, cylindrical capitula are clustered in dense flat-topped corymbs; each head has a single series of fused involucral bracts, few inconspicuous pale-yellow ray florets and several tubular disc florets. The fruit is a slender black cypsela bearing a pappus of a few short scales, some awned.

The oil glands yield the volatile "tagetes oil" used commercially and in traditional medicine, and the plant has well-documented allelopathic and nematicidal properties exploited in companion planting. A highly successful colonising annual, T. minuta is classed as an invasive or noxious weed in several regions and is of no conservation concern.

Author: L. · Sources: POWO (Kew), GBIF, Flora of China, Flora of North America, Soule taxonomic revision of Tagetes

Asteraceae

Tanacetum atkinsonii

by GP Jürgens

(C.B.Clarke) Kitam.

Sikkim2003 135 P183
India Sikkim Dzongri 4000m, August

Description

Tanacetum atkinsonii is an aromatic alpine composite of the Himalaya, recorded from Nepal, India, Bhutan and southern China, with GBIF holding around 102 occurrences across this range. It grows on open, stony alpine slopes, rocky pastures, screes and dry grassy banks in the high alpine zone, generally between about 3500 and 4500 m, where it tolerates strong insolation, cold and free-draining substrates. The illustrated plant from Dzongri in Sikkim at 4000 m, flowering in August, is characteristic of these exposed high-altitude habitats and of its late-summer flowering after the monsoon.

It is a perennial, aromatic herb with a woody rootstock producing erect to ascending stems and finely divided, pinnately dissected or bipinnatisect leaves that are grey-green and often hairy, releasing a tansy-like scent when crushed. The capitula (flower heads) are borne in a terminal corymb; each head has an involucre of imbricate, scarious-margined bracts and the typical Tanacetum structure of yellow disc florets, with the marginal florets reduced or shortly rayed rather than conspicuously ligulate. The fruit is a small, ribbed, glandular cypsela, usually with a short membranous corona rather than a true pappus.

Transferred to Tanacetum by Kitamura from an original placement under Chrysanthemum/Pyrethrum by C.B. Clarke, the species sits within the taxonomically fluid tansy group of the tribe Anthemideae, distinguished by its dissected aromatic foliage and reduced ray florets. A widespread high-Himalayan element, it is of no particular conservation concern.

Author: (C.B.Clarke) Kitam. · Sources: POWO (Kew), GBIF, Flora of Bhutan, Flora of China, Compositae of the Himalaya (specialist treatments)

Loranthaceae

Taxillus kaempferi

by GP Jürgens

(DC.) Danser

Bh09 415 P653
Bhutan Paro, 2400m June

Description

Taxillus kaempferi is a stem-hemiparasitic mistletoe ranging from Japan and Taiwan across China to the eastern Himalaya, with GBIF records from Japan, China, Taiwan, Bhutan and India. It parasitises the branches of trees and shrubs, particularly conifers such as Pinus and Tsuga as well as various broad-leaved hosts, in temperate montane forest generally between 1,500 and 2,800 m. The photographed plant grows near Paro in western Bhutan at about 2,400 m in June, representing the species at the western limit of its distribution in the Himalayan conifer belt.

The plant forms a pendent to spreading shrub attached to the host branch by a haustorial union and often by epicortical runners. The young branchlets, leaf undersides and inflorescences are clothed in a dense rusty to reddish stellate or dendritic tomentum, a key generic feature. The leaves are leathery, alternate to subopposite, ovate to elliptic with entire margins. The flowers are borne in short axillary umbels or racemes; each has a tubular, four-merous corolla that is reddish to orange and curved, splitting into recurved lobes at anthesis to expose the stamens, and is pollinated chiefly by birds. The fruit is a one-seeded berry with viscid pulp, dispersed by frugivorous birds that wipe the sticky seed onto new branches.

Taxillus belongs to the Loranthaceae, the showy aerial-parasite family, and is distinguished from related genera by its tomentum, umbellate inflorescence and floral structure. As a hemiparasite it retains chlorophyll while drawing water and minerals from the host. Though it can locally affect host vigour, T. kaempferi is a natural and widespread forest element, ecologically valuable as a nectar and fruit resource, and is not of conservation concern.

Author: (DC.) Danser · Sources: POWO (Kew), GBIF, Flora of China Vol. 5 (Loranthaceae), Grierson & Long: Flora of Bhutan Vol. 1, Barlow: Loranthaceae of Asia (taxonomic revisions)

Lamiaceae

Tectona grandis

by GP Jürgens

L.f.

Bhutan2015 95
Bhutan Galephug 300m, October
Bhutan2015 96
Bhutan Galephug 300m, October

Description

Tectona grandis L.f., the teak, is a large deciduous tree native to the monsoonal forests of South and Southeast Asia, including India, Myanmar, Thailand, Laos and Sri Lanka, and now widely planted and naturalised across the tropics in Indonesia, Brazil, Nigeria, Tanzania, Costa Rica and beyond. In the Himalayan foothills it is recorded from Bhutan at Galephug near 300 m in October, at the warm, low-elevation southern margin of the region. The species grows in tropical dry and moist deciduous forest, on well-drained alluvial and lateritic soils, typically below 1000 m, where a pronounced dry season triggers leaf fall. Its roughly 37 411 GBIF records reflect both its native range and its enormous footprint as a cultivated timber tree.

It is a tall tree reaching 30–40 m with a tall, often fluted bole and pale, fibrous, longitudinally fissured bark. The leaves are very large, opposite or sub-opposite, broadly elliptic to obovate, scabrid above and densely stellate-tomentose beneath, exuding a reddish sap when crushed. The small whitish to pale lilac flowers are five- to six-merous and borne in massive, much-branched terminal panicles. The fruit is a hard, four-chambered drupe enclosed in a conspicuously inflated, bladder-like accrescent calyx that aids wind and water dispersal.

Formerly placed in Verbenaceae, Tectona is now assigned to Lamiaceae (subfamily Tectonoideae) on molecular grounds, here matching the input family. Its heartwood, rich in protective tectoquinones and natural oils, is among the world's most prized timbers for its durability, dimensional stability and resistance to decay and insects, underpinning a vast plantation industry. While extensively cultivated, genuinely wild teak forests have been much reduced and fragmented by logging, and conservation of natural provenances and their genetic diversity is an ongoing priority.

Author: L.f. · Sources: POWO (Kew), GBIF, Flora of British India, Flora of Bhutan, Trees of Tropical Asia, Teak: A Global Overview (FAO monograph)