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6. Erigeron sect. Conyza (Lessing) Baillon, Hist. Pl. 8: 143. 1882.
白酒草组 bai jiu cao zu
Conyza Lessing, Syn. Gen. Compos. 203. 1832, nom. cons., not Linnaeus (1753).
Herbs, annual or biennial [or perennial], taprooted [caudex simple]; herbage hirsute to strigose [often glandular]. Stems simple or branched. Leaves linear to lanceolate, oblanceolate, or spatulate, base clasping or not, margin coarsely serrate or pinnatilobed, sometimes entire. Capitula erect in bud, in paniculiform, racemiform, or racemose-paniculiform synflorescences. Ray florets white, elaminate or lamina slightly longer than involucre. Achenes 0.8-2 mm, 2-veined. Pappus 1-seriate, of 10-25 bristles, not accrescent.
About 60-100 species: Africa, Asia, Australia, Europe, North and South America, some species widespread weeds in tropical and subtropical regions worldwide; two species (both introduced) in China.
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Lower cauline leaf blade margin usually coarsely 4-8-serrate per side, apex acute or acuminate; capitula in large and long paniculiform synflorescences, peduncles 3-5 mm; involucre ca. 4 mm; pappus white, later yellowish brown; ray floret lamina short, filiform. |
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38 E. sumatrensis |
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Lower cauline leaf blade margin usually coarsely serrate or pinnatilobed, sometimes entire, apex acute or obtuse; capitula in racemiform or racemose-paniculiform synflorescences, peduncles 10-15 mm; involucre ca. 5 mm; pappus reddish, sordid, or tawny; ray floret elaminate. |
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39 E. bonariensis |
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Lower Taxa
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