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Wild, H. (1967) The Compositae of the Flora Zambesiaca area. 1. Heliantheae. Kirkia 6(1) 1-62
Annual herbs (in ours). Leaves alternate, 2-pinnately lobed. Capitula in terminal panicles, radiate, heterogamous. Phyllaries in 2-3 series. Receptacular scales present. Disk florets sterile, ray florets fertile. Corolla of female florets small, subcircular; of disk florets narrowly funnel-shaped. Achenes of ray florets flattened, clasped by a phyllary and 2 lateral receptacular scales. Pappus of 2 recurved awns, forming an apparent rim to the achene. Derivation of name: a Greek generic name for Asteraceae with white florets Worldwide: 16 species in North America and the West Indies Botswana: 1 taxon. |
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