生活型

herb

形態特徵

• Erect branching annual herbs, stems thickened on the nodes, glabrous or hairy, up to about 60-75 cm height.
• Leaves ovate or ovate-oblong, trinerved, blade 1.5-7 cm long, 1-3 cm wide, base round and shortly attenuate, apex obtuse or acute, thinly long-pilose on both surfaces; margin shallowly crenate or serrate; petiole 0.5-1.5 cm long.
• Heads solitary or 2-4 in each axils, peduncles 0.5-1 cm long, erect at first, cernuous in fruit; involucres accrescent, bracts 5-8 in 1-2 series, elliptic-lanceolate, obtuse or acute, spreading and foliaceous, 4-6 mm long, 1-1.5 mm broad, green, keeled, long-pilose, bracteole membranous, oblong, apex long-pilose; ray florets often absent; disc florets yellow, 9-11, corollas tubular, 2-2.5 mm long, lobes 0.5 mm long, papillose; ovary 2 mm long; receptacle oblong-elliptic, acuminate, scarious, 3-4 mm long, ciliate at the margins; anthers black, base sagittate, apex truncate; style branches yellow, linear, apex covered with minute hairs.
• Achenes 2.5-3 mm long, verrucose on the 4-angles, minutely white puberulous near the apex, pappus wanting.

物候

Flowering and fruiting are possible throughout the year.

分布

• 台灣 : fairly common along roadsides, on waste lands, and on cultivated ground.

引證標本

S. Z. Yang, 28413 (PPI), 29 Feb. 1996, Wugoushuei, Pingtung county. S. Z. Yang, 28856 (PPI), 16 Apr. 2000; sugar factory, Pingtung city. G. P. Hsieh, 1967 (PPI), 15 Apr. 2005, Tungpin village, Pingtung county.

參考文獻

• Sheng-Zehn Yang and Gaung-Pu Hsieh. 2006. Taiwania 51(1): 46-49.