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Wild, H. (1967) The Compositae of the Flora Zambesiaca area. 1. Heliantheae. Kirkia 6(1) 1-62
Annual or perennial herbs. Leaves opposite. Capitula solitary on long peduncles, radiate, heterogamous. Ray florets female, fertile; disk bisexual and fertile. Involucre ± hemispheric. Phyllaries in 2 series, the outer shorter than or equal to the inner. Rays present, 3-lobed or dentate; disk florets cylindric, 5-lobed. Receptacular scales linear, ± keeled. Achenes silky-villous. Pappus of numerous densely plumose bristles. Worldwide: 30 species, American, mostly Mexico Burundi: 1 taxon. |
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