1. Family: Lamiaceae Martinov
    1. Leucas R.Br.

      1. This genus is accepted, and its native range is Africa to NE. Australia.

    [FTEA]

    Lamiaceae (Labiatae), A.J. Paton, G. Bramley, O. Ryding, R.M. Polhill, Y.B. Harvey, M. Iwarsson, F. Willis, P.B. Phillipson, K. Balkwill, C.W. Lukhoba, D.F. Otieno, & R.M. Harley. Leucas, G. Bramley. Flora of Tropical East Africa. 2009

    Habit
    Annual or perennial herbs, subshrubs or small shrubs
    Stem
    Stems erect, ascending or procumbent, usually pubescent with upward or downward-pointing to spreading hairs
    Leaves
    Leaves simple, opposite, sessile to distinctly petiolate
    Inflorescences
    Inflorescence with few to many verticils, congested or laxly spaced; verticils few–many-flowered, usually congested; bracts subtending verticils as leaves, often becoming reduced in size towards inflorescence axis, usually caducous in fruit; bracteoles minute to conspicuous
    Calyx
    Calyx tubular, throat symmetric to slightly oblique to asymmetric (lipped); lobes 5–10
    Corolla
    Corolla white, posterior lip curved inwards at apex, forming a hood over the style and stamens, densely pubescent on the outer surface, the hairs more plentiful, especially erect and downward-pointing along the margin of the hood, these also present on the inner surface of the lip margin; anterior lip divided into three lobes, the centre lobe longer and with a slight division at the apex
    Stamens
    Stamens 4; filaments with eglandular hairs about halfway up; thecae divaricate, confluent or weakly distinct
    Ovary
    Ovary 4-lobed, style gynobasic, unequally lobed
    Fruits
    Nutlets oblong-trigonous to obovoid with a small basal scar
    Note
    The first dichotomy in the key should be used with caution – in general the differences in bracteole length between species following the first lead and those following the second are readily apparent, but occasionally species with bracteoles typically 0.5–3 mm long have some up to 5(–6) mm long (hence the slight overlap in measurements); in this case whether the calyx is accrescent or not must be taken into account, and in addition bracteole shape (lead one species always have linear or subulate bracteoles, and in those following lead two tend to be linearlanceolate to ovate). This account is based on Sebald (1980), a revision of the Leucas of the African continent, the Arabian peninsula and Socotra. Sebald divided the genus into 13 sections: these sections are not listed here, although the species order roughly follows that of Sebald, with the addition of three new species, one new variety and change of status of two others.

    Images

    Distribution

    Native to:

    Afghanistan, Andaman Is., Angola, Assam, Bangladesh, Benin, Borneo, Botswana, Burkina, Burundi, Cambodia, Cameroon, Cape Provinces, Cape Verde, Central African Repu, Chad, China South-Central, China Southeast, Christmas I., Comoros, Congo, Djibouti, East Himalaya, Egypt, Eritrea, Ethiopia, Free State, Gambia, Ghana, Guinea, Guinea-Bissau, Gulf of Guinea Is., Gulf States, Hainan, India, Iran, Ivory Coast, Japan, Jawa, Kenya, KwaZulu-Natal, Laos, Lesser Sunda Is., Liberia, Madagascar, Malawi, Malaya, Maldives, Mali, Maluku, Mauritania, Mauritius, Mozambique, Myanmar, Namibia, Nansei-shoto, Nepal, New Guinea, Nicobar Is., Niger, Nigeria, Northern Provinces, Ogasawara-shoto, Oman, Pakistan, Philippines, Queensland, Rwanda, Saudi Arabia, Senegal, Sierra Leone, Sinai, Socotra, Somalia, Sri Lanka, Sudan, Sulawesi, Sumatera, Swaziland, Taiwan, Tanzania, Thailand, Tibet, Togo, Uganda, Vietnam, West Himalaya, Yemen, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Brazil Northeast, Brazil Southeast, Caroline Is., Cook Is., Costa Rica, Dominican Republic, Fiji, Haiti, Leeward Is., New Caledonia, Niue, Samoa, Seychelles, Society Is., Solomon Is., Tonga, Trinidad-Tobago, Tuamotu, Wallis-Futuna Is., Windward Is.

    Leucas R.Br. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1976 Maitland, T.D. [480], Cameroon K000025467
    Ash [1112], Ethiopia 35504.000
    Ash [1118], Ethiopia 35534.000
    Ash [1885], Ethiopia 35605.000
    Ash [1565], Ethiopia 35682.000
    Leeuwenberg, A.J.M. [8502], Cameroon K000025459

    First published in Prodr. Fl. Nov. Holland.: 504 (1810)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of West Tropical Africa
    • —F.T.A. 5: 472.
    Flora of Tropical East Africa
    • Kubitzki, Fam.-Gen. Vasc. Pl. 7: 227 (2004)
    • Stuttgarter Beitr. Naturk., ser. A, 308: 1–42 (1978) & 341: 1–200 (1980)
    • Stuttgarter Beitr. Naturk., ser. A, 341: 1–200 (1980)
    • Stuttgarter Beitr. Naturk., ser. A, 308: 1–42 (1978)
    • Prodr. Fl. Nov. Holl.: 504 (1810)

    Sources

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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. 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 2019. 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

    Plants and People Africa
    Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
    © Plants and People Africa http://www.plantsandpeopleafrica.com http://creativecommons.org/licenses/by/3.0/