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Flora of Taiwan | Family List | Compositae | Sonchus

Sonchus arvensis L., Sp. Pl. 793. 1753; Kitamura, Mem. Coll. Sci. Kyoto Imp. Univ., Ser. B, Biol. 23: 147. 1956; Li, Fl. Taiwan 4: 940. 1978.


Sonchus arvensis

Credit: HAST

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).

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.

All temperate and many tropical countries, wild or introduced. Taiwan, wastelands and river banks, low to mid elevations, common.


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