生活型

herb

形態特徵

• Annual herb up to 100 cm tall, subglabrous or minutely puberulent on younger parts.
• Leaves narrowly elliptical to lanceolate, 1–11 cm long by 0.3–2.7 cm wide, narrowly cuneate at base, the apex subacute; submarginal vein weakly developed; petioles 2–15 mm long, winged.
• Sepals 4, rarely 5, deltoid, (1.3-)2–3.5 mm long, (0.5-)0.7–1.8 mm wide, glabrous or minutely puberulent. Petals yellow, elliptical, 1–3 mm long, 0.7–2 mm wide. Stamens usually as many as sepals, rarely more; filaments 0.3-0.7 mm long; anthers 0.5-0.7 mm long, 0.5-0.7 mm thick, shedding pollen directly on the stigma at anthesis. Pollen shed in tetrads. Disc slightly elevated, glabrous. Style 0.7–1.5 mm long; stigma globose, 0.4-0.5 mm thick.
• Capsule thin-walled, glabrous or puberulent, 3–16(–19) mm long, terete, pale brown, readily and irregularly loculicidal; capsule sessile or on a pedicel up to 6 mm long, often more or less nodding. Seeds pluriseriate in each locule of the capsule, free, brown with fine brown lines, ellipsoid-rounded, 0.3-0.5 mm long, 0.2-0.25 mm wide; raphe inconspicuous.
• Gametic chromosome number, 2n = 16.

物候

Flowers Jul-Nov; fruit Jul-Nov.

分布

• 台灣 : Rare, in wet places at low elevation.
• 世界 : Africa, tropical and subtropical Asia, China, through Malaysia to and throughout tropical Australia and New Caledonia.

引證標本

TAICHUNG: Campus of National Chung-Hsing University, Peng 6445. TAINAN: Chiali, Morimoto 53; Matou, Lai 18955.

引用文獻

• RAVEN, PETER H. and PENG, CHING-I, Flora of Taiwan, second edition 3: 960-962. 1993.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)