生活型

herb

形態特徵

• Annual or short-lived perennial herbs to 100 cm long; branches patently short hairy.
• Leaves oblong to oblong-lanceolate, 2–7 cm long, 0.8–3 cm wide, apex acute, base attenuate, scabrous; petioles 1–10 mm long; stipular sheath ca. 2 mm wide, with seta 1.5–4 mm long.
• Flowers 10-many in heads; calyx 2–3.5 mm long, lobes 6, trullate; corolla white, 3–4 mm long, tube with a ring of hairs inside, lobes pubescent on upper outside; stamens exserted; style ca. 3.5 mm long, exserted.
• Fruit obovoid, with 3 distinct grooves, hispidulous.

分布

• 台灣 : naturalized along northern and western coastal areas, in open sunny sandy soil from sea level to ca. 300 m.
• 世界 : Native to tropical America.

引證標本

TAIPEI: Kungliao, Yang 2747; Yenliao, Chiang 358. TAOYUAN: Jenmei, Kao 6328. HSINCHU: Hungmao, Ou & Kao 8851; Shanchiao, Chaw & Peng 334. MIAOLI: Chiting, Hsu 14576. TAICHUNG: Tatushan, Yang 467.YUNLIN: Taihsi, Yang 524. KAOHSIUNG: Kaohsiung, Chen s. n. 1973. PINGTUNG: Hengchun, Huang & Hsiao 8204; Oluanpi, Ou & Kao 9010.

引用文獻

• LIU, Ho-Yih, YANG, T. Y. Aleck, LI, Sung-Po and LI, Hen-Jung, Flora of Taiwan, second edition 4: 321. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)