生活型

herb

形態特徵

• Annuals or biennials; stems stout, 30–100 cm tall, often branched, hollow, nearly glabrous.
• Lower cauline leaves thin, oblong, 10–20×5–7 cm, apex obtuse or acute, base narrowed, winged-petiolate, pinnately parted to divided, segments oblong or deltoid, 3 or 4 pairs, irregularly spine toothed, glabrous on both surfaces; median leaves oblong, 10–22×4.5–10 cm, apex obtuse or acuminate, base auriculate clasping, auricles acute or partite, segments of 2 or 3 pairs, irregularly spiny-dentate; upper leaves oblong-lanceolate to lanceolate, few.
• Heads ca. 2 cm across, in umbels, yellow; peduncle 1.5–5.5 cm long, glandular hairy; involucre 1.2–1.5×1.2–1.8 cm; bracts 3- or 4-seriate, glandular pilose on midrib outside, oblong-lanceolate, outer bracts 3.4–4.5 mm long, median bracts 6–9 mm long, inner bracts 9 mm long, with transparent margins. Florets 11–12 mm long, many, yellow.
• Achenes narrowly oblong, 2.5–3×*1 mm, with scaberulous ribs. Pappus bristles slender, ca. 6 mm long, white.
• Chromosome number, 2n = 32 (Peng & Hsu, 1978).

分布

• 台灣 : waste grounds and roadsides, low to mid elevations, common.
• 世界 : Eurasia.

引證標本

TAIPEI: Kungliao, Liao 1127. ILAN: Chuan, 13836; Nanfangao, Peng 13749. TAOYUAN: Fuhsing, Peng 10315. HSINCHU: Hengshan, Peng 13679. MIAOLI: Chunan, Lin 571. TAICHUNG: Techi, Peng 12477; Chika, Peng 9718. NANTOU: Tzuchung, Peng 11426. CHIAYI: Auku, Liao 1697. KAOHSIUNG: Shoushan, Yang 325. PINGTUNG: Wutai, Lin 355. TAITUNG: Lanyu Is., Peng 7646. HUALIEN: Pilu, Peng 9223.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1073. 1998.  (Fl. Taiwan 2nd edit.)