生活型

herb

形態特徵

• Perennial coarse herbs to 1.5 m tall; stems often purple, terete, erect, glandular puberulent.
• Leaves opposite, median ones larger, ovate-deltoid, 7–10 cm long, 4–7 cm wide, apex acuminate, base obtuse to very broadly cuneate or truncate, sparsely pilose on both surfaces, 3-nerved, margins crenate, petiole 4–5 cm long, upper leaves gradually smaller toward inflorescence.
• Inflorescence of loose compound corymbs, heads ca. 6.5 mm long, 6 mm in diam., peduncle 8–14 mm long, densely pubescent; involucre cylindric, ca. 3–4 mm long; bracts ca. 25, 3 or 4 seriate, outer ones narrowly lanceolate, inner ones narrowly oblong, apex acute, base obtuse, margins membranaceous, ciliate; florets ca. 70–80, white; receptacle glabrous, areolate.
• Achenes black, 1.5 mm long, 5-angular, glabrous. Pappus of 8–10 bristles, ca. 3.5 mm long.

分布

• 世界 : Native of Mexico, California and the West Indies, widely adventive in tropical areas.

引證標本

KAOHSIUNG: Tengchih, Yen 4616. TAITUNG: Litao, Chen 14333.

引用文獻

• PENG, Ching-I, CHUNG, Kuo-Fang & LI, Hui-Lin, Flora of Taiwan, second edition 4: 818. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)