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197. Pluchea Cassini, Bull. Sci. Soc. Philom. Paris. 1817: 31. 1817.
阔苞菊属 kuo bao ju shu
Shrubs or herbs, ± aromatic. Leaves alternate, simple. Synflorescences elongate panicles or flat-topped. Capitula many flowered, disciform, usually numerous. Phyllaries imbricate. Marginal florets numerous, in several rows, filiform, female, fertile; achenes 4- or 5-angled, longitudinally grooved. Central florets far fewer than marginal ones, tubular, bisexual, functionally male; anthers obtuse at apex, tailed at base. Style entire, sometimes divided, style branches with obtuse sweeping hairs reaching below furcation; achenes often indistinct or vestigial as a small ring of basal sclerenchymatous cells of carpopodium. Pappus of basally connate, barbellate bristles in 1 row. x = 10.
About 80 species: Africa, SE Asia, Australia, Caribbean, North and South America, Pacific islands; five species (two introduced) in China.
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| 1 |
Plants decumbent-ascending, herbaceous, slightly woody at base; branches glabrous or sparingly puberulent; peduncles and involucres glabrous. |
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1 P. pteropoda |
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Plants erect, shrubby; branches densely pubescent; peduncles and involucres tomentose |
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(2) |
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| 2 (1) |
Stems and branches conspicuously winged by decurrent leaves; capitula hemispheric (when fresh); central florets 50-60. |
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2 P. sagittalis |
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Stems and branches not winged; capitula campanulate (when fresh); central florets usually less than 25 |
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(3) |
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| 3 (2) |
Leaves linear. |
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3 P. eupatorioides |
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Leaves obovate to elliptic |
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(4) |
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| 4 (3) |
Branches densely tomentose; leaves thinly papery, petiolate, margins subentire; central florets 20-25; receptacle glabrous. |
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4 P. carolinensis |
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Branches finely crisp hairy; leaves thickly papery, subsessile, margins dentate; central florets 2-7; receptacle densely hirsutulous. |
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5 P. indica |
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Lower Taxa
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