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190. Pentanema Cassini, Bull. Sci. Soc. Philom. Paris. 1818: 74. 1818.
苇谷草属 wei gu cao shu
Shrublets or annual herbs. Stems not winged, without resin canals. Leaves alternate, oblong to lanceolate, entire to serrate, often villous. Capitula generally heterogamous, radiate, but in some species heterogamous disciform, or homogamous discoid. Hibernating young capitula often present in frutescent species. Receptacle epaleate, smooth. Marginal florets female; corolla yellow, radiate, miniradiate, or ± tubular; epidermis not crested. Disk florets bisexual; corolla yellow; epidermis with straight cell walls, with needlelike crystals; corolla lobes short, smooth. Anthers ecalcarate, with branched tails; endothecial tissue radial; cells of antheropodium wider than long. Pollen spines with a cavity. Style branches with acute sweeping hairs, not reaching furcation. Achenes with elongated crystals. Pappus of barbellate, capillary bristles in 1 row. x = 9.
About 18 species: Africa, C, S, and SE Asia; three species in China.
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Leaf base hastate or auriculate; achenes densely pubescent. |
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1 P. indicum |
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Leaf base narrower or cordate; achenes sparsely pubescent |
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(2) |
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| 2 (1) |
Plants puberulent; capitula pendulous; leaves scabrid on both surfaces. |
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2 P. cernuum |
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Plants densely pilose; capitula erect; leaves densely pilose on both surfaces. |
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3 P. vestitum |
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Lower Taxa
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