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Dinghushan | Family List | Compositae | Tridax

Tridax procumbens L.

羽芒菊

Description from Flora of China

Herbs, annual to perennial, caulescent, decumbent. Stems procumbent, branched at base, branches slender, spreading or ascending, 20-50 cm, hirsute. Leaves few, shortly petiolate; blade ovate to ovate-lanceolate, 2.5-5 cm, base cuneate, margin deeply irregularly serrate, pinnatisect, segments few, narrow, apex acute or acuminate. Capitula solitary, 1-1.5 cm in diam.; peduncle 10-30 cm; involucre subcampanulate, 6-7 mm; phyllaries few seriate, hispid, outer densely grayish white, elliptic, ca. 5 mm, long hirsute, inner tinged purplish, narrower, ca. 6 mm. Ray florets 4, white. Disk florets yellow, tube ca. 5 mm, limb 5-lobed, lobes reflexed, hairy. Achenes brown, oblong, ca. 2 mm, densely silky pubescent; pappus setae 5-6 mm, shiny, plumose. Fl. Nov-Mar. 2n = 36.

A widespread weed, along exposed dry roadsides, wastelands, lawns. Fujian, Hainan, Taiwan [native to tropical America; now a pantropical weed].

生活型: 草本

栽培植物: 野生

特征: 多年生,蔓状草本;

花期: 12

生境: 见于七星岩、石炭岩洞中

门中名: 种子植物门

亚门中名: 被子植物亚门

纲中名: 双子叶植物纲


 

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