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This genus is accepted, and its native range is Africa, Asia to N. Australia.
Trichodesma

[FZ]

Boraginaceae, E. S. Martins (Trichodesma by R. K. Brummit). Flora Zambesiaca 7:4. 1990

Morphology General Habit
Annual or perennial herbs to small shrubs, often with conspicuously tuberculate hairs.
Morphology Leaves
Lower leaves usually opposite or sub-opposite, upper ones usually alternate.
Morphology Reproductive morphology Inflorescences
Inflorescence either a bracteate one-sided cyme or a branching system of ebracteate very lax cymes.
Morphology Reproductive morphology Flowers
Flowers (calyx, corolla and stamens) 5-merous or occasionally some flowers in T. zeylanicum 6-merous.
Morphology Reproductive morphology Flowers Calyx
Sepals free to the base or loosely adherent along lower margins, usually ovate to lanceolate and rounded to cordate at the base, strongly accrescent in fruit.
Morphology Reproductive morphology Flowers Corolla
Corolla campanulate to funnel-shaped, with ovate-acuminate to broadly triangular lobes which are often spreading or reflexed, without scales at the throat.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens sessile or subsessile, the filament absent or less than 1 mm. long and broader than long, the anthers oblong and inserted on the inner side of the connectives which are prolonged above the anthers, the whole androecium converging above to form a cone with the connective prolongations twisted together at the apex, the connectives with long shaggy hairs on their dorsal surface.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 4-lobed, with straight gynobasic style, the stigma scarcely differentiated.
Morphology Reproductive morphology Fruits
Fruit either of four smooth or variously ornamented nutlets attached to a pyramidal gynobase or (by abortion) of a single sessile nutlet (see note on sections below).

[FSOM]

M. Thulin. Flora of Somalia, Vol. 1–4 [updated 2008] https://plants.jstor.org/collection/FLOS

Distribution
Some 45 species in the tropics and subtropics of Africa, Asia and Australia.
Morphology General Habit
Herbs or subshrubs
Morphology Leaves
Leaves alternate or subopposite, entire
Morphology Reproductive morphology Flowers
Flowers regular, in terminal cymes
Morphology Reproductive morphology Flowers Calyx
Calyx 5–6-lobed, enlarged in fruit
Morphology Reproductive morphology Flowers Corolla
Corolla-tube with naked throat; lobes 5–6, spreading or reflexed, ± acuminate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5–6, attached in corolla-tube; anthers subsessile, ± pubescent on the back, often forming an exserted cone, each anther with a terminal linear usually twisted appendage
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 4-lobed; style gynobasic, filiform; stigma capitate
Morphology Reproductive morphology Fruits
Fruit of 1–4 mostly ovoid nutlets; nutlets smooth, variously spiny or hairy on the back.

[FTEA]

Boraginaceae, B. Verdcourt. Flora of Tropical East Africa. 1991

Morphology General Habit
Herbs or subshrubs, hispid, hairy or sometimes almost glabrous, erect
Morphology Leaves
Leaves alternate or subopposite
Morphology Reproductive morphology Flowers
Flowers pedicellate in lax sometimes many-flowered terminal cymose inflorescences
Morphology Reproductive morphology Flowers Calyx
Calyx deeply divided into 5–6 imbricate ovate to lanceolate lobes which are often winged, narrowed to cuspidate at the apex, rounded to cordate at the base, accrescent
Morphology Reproductive morphology Flowers Corolla
Corolla blue or white, subrotate or funnel-shaped; tube with naked throat; lobes 5–6, ovate, ± cuspidate at the apex
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5–6, with very short and flattened filaments; anthers oblong or linear-lanceolate, ± pubescent on back, nearly always forming a cone with the connectives produced above the thecae in a linear usually twisted appendage
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary ovoid, 4-lobed
Morphology Reproductive morphology Flowers Gynoecium Pistil
Style gynobasic or terminal, long and subulate; stigma small, subglobose
Morphology Reproductive morphology Fruits
Fruits with 4 ovoid nutlets, 3-angled on the ventral face or one discoid sometimes margined nutlet, smooth, rugose or hairy on the back
Morphology Reproductive morphology Seeds
Seeds subglobose or obovoid.

Native to:

Afghanistan, Algeria, Angola, Assam, Bangladesh, Benin, Botswana, Burundi, Cameroon, Cape Provinces, Cape Verde, Central African Repu, Chad, China South-Central, Comoros, Djibouti, East Himalaya, Egypt, Eritrea, Ethiopia, Free State, Ghana, Gulf States, India, Iran, Iraq, Ivory Coast, Jawa, Kazakhstan, Kenya, Kirgizstan, KwaZulu-Natal, Laos, Lebanon-Syria, Lesser Sunda Is., Libya, Madagascar, Malawi, Mali, Mauritania, Morocco, Mozambique, Myanmar, Namibia, Nepal, New Guinea, New South Wales, Niger, Nigeria, Northern Provinces, Northern Territory, Oman, Pakistan, Palestine, Philippines, Queensland, Rwanda, Saudi Arabia, Senegal, Sinai, Socotra, Somalia, South Australia, Sri Lanka, Sudan, Swaziland, Tadzhikistan, Taiwan, Tanzania, Thailand, Turkey, Turkmenistan, Uganda, Uzbekistan, Vietnam, West Himalaya, Western Australia, Western Sahara, Yemen, Zambia, Zaïre, Zimbabwe

Introduced into:

Fiji, Mauritius, Rodrigues, Réunion, Windward Is.

Trichodesma R.Br. appears in other Kew resources:

First published in Prodr. Fl. Nov. Holland.: 496 (1810)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Flora of West Tropical Africa

  • —F.T.A. 4, 2: 44. Nom. cons.

Flora Zambesiaca

  • Prodr. Fl. Nov. Holl.: 496 (1810) nom. conserv.

Flora of Somalia

  • Flora Somalia, Vol 3, (2006) Author: by M. Thulin [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • Brand in E.P. IV. 252 (78): 19–44, figs. 2–4 (1921)
  • Brummitt in K.B. 37: 429–450 (1982)
  • Prodr. Fl. Nov. Holl.: 496 (1810)
  • in K.B. 40: 851–854 (1985), nom. conserv.

Art and Illustrations in Digifolia
Digital Image © Board of Trustees, RBG Kew

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0