生活型

herb

形態特徵

• Annual or perennial herb, well branched from base and often also above, the branches 0.6–5 dm long; pubescence strigillose, usually mixed with longer spreading hairs.
• Leaves elliptic to lanceolate, rarely obovate, 1–8 cm long, weakly serrate to sinuate-pinnatifid.
• Flowers in upper leaf axils; floral tube 9–29 mm long, straight (slightly curved) in young buds; sepals 17–32 mm, with distinct free tips 0.4–3.5 mm long; petals 16–38 mm, white fading rose-purple; anthers 4–10 mm; pollen ca. 90%+ fertile; stigma elevated above anthers.
• Capsule club-shaped or obovoid, 4-winged, 7.5–20 mm long, 5.5–17 mm wide with slender stipe 5–37 mm long. Seeds clustered in each locule, 1–1.5 mm long, 0.5-0.7 mm thick, finely granular.
• 2n = 14

物候

Flowers May-Aug; fruit Jun-Oct.

分布

• 台灣 : Along roadsides and the borders of fields; 1,000–2,200 m.
• 世界 : Native to central and northern Mexico and Texas in N America, at ca. 300–1,500 m.; widely naturalized as an escape from cultivation in many parts of the world, including Taiwan.

引證標本

TAICHUNG: Lishan, Kuo 8391; Wuling, Peng 11997. NANTOU: Tunyuan to Yunhai, Huang, Hsieh & Kao 5704; Shouting, Peng 10856.

參考文獻

• RAVEN, PETER H. and PENG, CHING-I. 1993. Flora of Taiwan, second edition 3: 965. (Fl. Taiwan 2nd edit.)