生活型

herb

形態特徵

• Stems erect, to 2 m tall, glabrous, umbellately branched apically.
• Radical leaves oblong-oblanceolate, 8–20×5–6 cm, apex obtuse, base narrowed, margins entire or denticulate, glabrous on both surfaces; lower cauline leaves narrowly oblong, 23–28×5 cm, apex obtuse, auriculate-clasping, margins denticulate, glabrous; upper leaves remote, gradually smaller, lanceolate, auriculate-clasping.
• Inflorescence pseudo-umbellate; peduncle 2–5 cm long, glandular hispid. Involucre black, broadly tubular, 13–24×2–2.5 mm, densely or sparsely glandular hispid, bracts 3- or 4-seriate, outer ones lanceolate, 3–4 mm long, apex obtuse, margins transparent. Florets many; corolla 12–14 mm long.
• Achenes narrowly oblong, 3×*0.8 mm, compressed, 5-ribbed. Pappus bristles slender, 9 mm long, white, deciduous.
• Chromosome number, 2n = 18 (Peng & Hsu, 1978).

分布

• 台灣 : wastelands and river banks, low to mid elevations, common.
• 世界 : All temperate and many tropical countries, wild or introduced.

引證標本

TAIPEI: Nankang, Wang 780. ILAN: Nanfangao, Peng 13748; Jentse, Peng 10319. TAOYUAN: Fuhsing, Peng 10303. HSINCHU: Kuanwu, Peng 14898. MIAOLI: Taian, Liu 72. TAICHUNG: Kukuan, Peng 8731. NANTOU: Chitou, Peng 5349; Tienchih, Ho 572. CHIAYI: Tzuchung, Ho 1185; Chuchi, Lai 35. KAOHSIUNG: Tengchih, Peng 11218; Yenchao, Peng 13438. PINGTUNG: Wutai, Lin 356. TAITUNG: Taiyuanhsiaku, Chen 461; Lanyu Is., Peng 6656. HUALIEN: Hoping forest path, Peng 5817; Kuailin to Chilai, Ho 673.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1071. 1998.  (Fl. Taiwan 2nd edit.)