生活型

herb

形態特徵

• Annual herbs, erect, ascending or decumbent, ca. 30 cm tall; stems usually branched, glabrous.
• Leaves elliptic to rhombic-ovate, 2–7 cm long, 1.5–4 cm wide, broadly cuneate at base, deeply retuse at apex, glabrous on both surfaces; petioles to 4 cm long.
• Inflorescences terminal and in upper axils, the terminal elongate, to 7 cm long, the lower shorter to subglobose; flowers with inconspicuous bracts shorter than perianth, narrowly ovate, minutely awned.
• utricle indehiscent, ovate, slightly wrinkled below, constricted and smooth upward; seeds orbicular, black and shining, surface supra-reticulate.

分布

• 世界 : A naturalized weed, native in warm temperate and tropical areas, common in waste places and on roadsides.

引證標本

TAIPEI: Kuanyinshan, Chuang 3918. TAICHUNG: Taichung, Ou & Lu 5908; Chengkongling, Kuo 6011.

參考文獻

• LIU, TANG-SHUI and KAO, MUH-TSUEN, Flora of Taiwan, second edition 2: 398. 1996.  (Fl. Taiwan 2nd edit.)