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Published In: Prodromus Florae Novae Hollandiae 504. 1810. (Prodr.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Text: I.C. Hedge
General/Distribution: A palaeotropical genus of about 80 species with two main centres: one in Africa, especially east tropical Africa; the other in the Indian subcontinent. Most of our species are quite clear-cut.


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Annual or perennial herbs with a pilose to villous eglandular indumentum of simple hairs. Leaves undivided, entire to crenate-serrate, petiolate at least on lower leaves, usually gland-dotted. Verticillasters many-flowered, distant from each other, borne in axils of upper leaves. Bracts numerous, subulate to ovate-lanceolate, shorter than to as long as calyces. Flowers white, sometimes with cream, rose or green markings. Calyx with 10 often ribbed veins, tubular, straight or curved; mouth truncate to prominently oblique, pilose to vinous at throat; teeth 8-10, equal or unequal. Corolla rather small, bilabiate; tube included in calyx, internally oblique-annulate or not; upper lip hooded or ± straight, densely white-bearded; lower lip with a median lobe clearly larger than laterals, usually much longer than upper lip. Stamens 4, didynamous, included within corolla upper lip; thecae 2-locular, eventually confluent. Style shortly 2-lobed. Nutlets 4, oblong, trigonous, obtuse to truncate-rounded at apex.

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1 Annuals (2)
+ Perennials (5)
2 (1) Throat of calyx prominently hairy with long hairs (3)
+ Throat of calyx glabrous or somewhat pilose with very short hairs (4)
3 (2) Calyces slightly curved, not reflexed; calyx teeth upto 1 mm; bracts imbricate, numerous 6 Leucas cephalotes
+ Calyces prominently curved, some ± reflexed; calyx teeth upto 2.5 mm; bracts not imbricate 7 Leucas nutans
4 (2) Stems with short spreading hairs; bracts c 1/2 length of calyces 5 Leucas aspera
+ Stems with very short ± retrorse hairs; bracts more than 1/2length of calyx 4 Leucas urticifolia
5 (1) Leaves ovate; calyces with a prominent indumentum (6)
+ Leaves linear, entire-margined; calyces glabrous or with few hairs 3 Leucas hyssopifolia
6 (5) Stem indumentum of retrorse hairs; plant greyish green 1 Leucas mollissima
+ Stem indumentum of spreading or antrorse hairs; plant white lanate 2 Leucas lanata
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