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Published In: Edwards's Botanical Register 15: , pl. 1282. 1829. (Edwards's Bot. Reg.) 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: About 30 species in the Old World tropics, but the total varies according to the circumscription of the genus.


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Annuals. Stems branched, erect, with an indumentum of simple hairs. Leaves undivided, petiolate or sessile, crenate or serrate. Inflorescence of dense axillary and terminal ovoid or oblong heads; verticillasters many-flowered. Bracts large, hidden within heads, subtending several flowers, imbricate. Flowers white to pink, very small. Calyx tubular-campanulate, bilabiate, 7-10-nerved, apparently with one large entire upper lobe and 4 lower teeth; tube glabrous at throat; calyx enlarging in fruit, flattened above with converging lips. Corolla scarcely bilabiate, subequally 5-lobed, slightly or not longer than calyx. Stamens 4, inconspicuously declinate; thecae glabrous unilocular. Nutlets very small, smooth or finely papillate.
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