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Flora of Taiwan | Family List | Compositae | Tridax

Tridax procumbens L., Sp. Pl. 900. 1753; Fukuyama in Masamune, Short Fl. Formosa 226. 1936; Li, Fl. Taiwan 4: 953, pl. 1260. 1978.


Tridax procumbens

Credit: HAST

Perennial herbs, caulescent, decumbent. Stems procumbent, branched at base, branches slender, spreading or ascending, 20-50 cm long, hirsute. Leaves short petiolate, ovate to ovate-lanceolate, few, 2.5-5 cm long, apex acute or acuminate, margins deeply irregularly serrate, pinnatisect, segments few, narrow, base cuneate. Heads solitary, 1-1.5 cm across, peduncle 10-30 cm long. Involucre subcampanulate, 6-7 mm long. Involucral bracts hispid, in few series; outer bracts densely grayish white, elliptic, ca. 5 mm long, long hirsute; inner bracts tinged purplish, narrower, ca. 6 mm long. Ray florets 4, white, ligulate or 2-lipped. Disc florets yellow, tube 5 mm long, limb 5-lobed, lobes reflexed, hairy. Achenes brown, oblong, ca. 2 mm long, densely silky pubescent. Pappus 5-6 mm long, of shiny feathery bristles.

MIAOLI: Tunghsiao, Peng 11572. TAICHUNG: Fengyuan, Peng 12164. NANTOU: Hsinyi, Chunta forest road, Wang 203; Tsaotun, Chen 456. TAINAN: Szukunshen, Wang 877. PENGHU: Shanshui, Chen 701. PINGTUNG: Fangshan, Chen 921; Manchou, Peng 7828. TAITUNG: Lanyu Is., Peng 5177; Hungyeh, Leu 833.

Tropical America; abundantly naturalized in the lowlands of central and southern Taiwan, along exposed, dry roadsides, on waste grounds and in lawns.


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