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. Flowers May-Aug; fruit Jun-Oct.
TAICHUNG: Lishan, Kuo 8391; Wuling, Peng 11997. NANTOU: Tunyuan to Yunhai, Huang, Hsieh & Kao 5704; Shouting, Peng 10856.
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. Along roadsides and the borders of fields; 1,000-2,200 m.
