生活型

herb

形態特徵

• Perennial herbs, the stem prostrate, 1 mm across, somewhat woody, brown-pilose, rooting at nodes.
• Leaves alternate, distichous; blades oblong-ovate, oblong-orbicular to orbicular, 1-2 cm long and 8-18 mm wide, entire, cordate at the base with rounded lobes, the apex emarginate, sparsely pubescent on lower veins; petioles 2-5 mm long, brown-pilose.
• Flowers solitary, axillary; pedicels 2-2.5 mm long, up to 5 mm and reflexed when fruiting, sparsely brown-pilose, bracts 2, linear, 1.2 mm long and 0.5 mm wide, abaxially pubescent; sepals 5, erect, about equal in length, 2.5-3 mm long, 1.5-2 mm wide, oblong to elliptic with an mucronulate apex, the inner slightly narrower, all abaxially brown-pubescent and ciliate; corolla white, subrotate, 6-8 mm across, deeply 5-lobed, the lobes obovate, 2-2.5 mm long, 2.5-3 mm wide, emarginate at the apex, plicate, the midpetaline bands sparsely brown-pilose outside, the tube 2 mm long and 1 mm wide, fleshy-ridged and occasionally with 2 to 4 petal-like appendages within the base; stamens 5, white, included, the filaments inserted on the tube, 1.5-2 mm long, the anthers oblong, 1 mm long; ovary ovoid, 1 mm across, yellow, glabrous, the styles 2, white, filiform, 4 mm long, each style deeply bifid nearly to the base, the stigmas white, subclavate.
• Capsules globose, 4 mm across, flushed with purple, when dry becoming to light brown. Seeds 2 to 4, pyriform, 2 mm long and 1mm wide, straw-colored with purplish spots, papillose on the surface.

分布

• 台灣 : in the southern coastal counties, found on lawns, at disturbed places such as roadsides, traffic islands, parking lots and other waste ground, and in open sunny sandy soils.
• 世界 : an almost pantropic weed, originally from Mexico through the West Indies and Central America to South America, introduced and naturalized in several Old World regions including Africa, Madagascar, Malaysia, and Ceylon. It also occurs in India and Nepal,

引證標本

Kaohsiung City: Siaogang, along roadsides and on traffic islands, near Kaohsiung International Airport, 17 October 2008, Chen s. n. (NHU). Tainan City : on lawns of Tainan Airport, Su 360 (NHU).

參考文獻

• Shih-Huei Chen, Jian-Yu Su and Ming-Jou Wu, Taiwania 54(3): 273-278. 2009.