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2. Pterocephalus Vaillant ex Adanson, Fam. Pl. 2: 152, 595. 1763.
翼首花属 yi shou hua shu
Herbs, perennial or annual, or sometimes subshrubs. Leaves basal, rosulate, entire, pinnatifid to pinnatisect. Capitula solitary, terminal; involucre of 2, rarely 3 whorls of 4-6 involucral bracts; receptacles covered with hirsute hairs or bracts; involucel 1, 4-8-ribbed, apex obscurely dentate, or corona-like, or membranous and dentate. Calyx segmented and 8-24-setose or pinnate. Corolla 4- or 5-lobed, that of central flowers nearly actinomorphic, that of marginal flowers nearly 2-lipped; upper lip with 1 lobe, entire or 2-lobed; lower lip usually 3-lobed. Stamens 4, rarely 2 or 3, inserted at upper part of corolla, exserted. Ovary inferior, enveloped by involucels. Achenes smooth or ribbed. Seeds with a large, straight embryo and scanty endosperm.
About 25 species: from the Mediterranean to C Asia and tropical Africa; two species (one endemic) in China.
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Leaves spatulate or linear-spatulate, entire or narrowly segmented; inflorescences globose in fruit; involucral bracts of outer layer narrowly ovate; persistent calyx segmented into 20 pinnate hairs; corolla 5-lobed, obovoid, 4-5 mm. |
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1 P. hookeri |
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Leaves oblong-lanceolate or oblanceolate, pinnatifid to bipinnatisect; inflorescences compressed globose in fruit; involucral bracts of outer layer lanceolate; persistent calyx segmented into 8 brown setae; corolla 4-lobed. |
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2 P. bretschneideri |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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