生活型

herb

形態特徵

• Perennial rhizomatous erect herbs, stems sulcate-striate, 50–100 cm tall, sparsely branched, strigose and rough to touch. Radical leaves withering at anthesis.
• Radical leaves withering at anthesis. Cauline leaves linear-oblong to oblanceolate, 2.5–3.5 cm long, 1–2 cm wide, apex acute or obtuse, base cuneate into short petiole or leaves sessile, entire or coarsely dentate on upper margin, scabrous on both surfaces, margins scabrous-ciliate; upper leaves gradually smaller, linear-lanceolate, subentire.
• Heads solitary or few in loose corymbiform inflorescences, 6–8 mm tall, 8–10 mm across. Involucre hemispheric, 5.8–6.1 mm long, 6.6–8.2 mm wide, bracts in 3 or 4 series, green, oblanceolate, triangular, acute, sparsely pubescent apically, margins submembranaceous, ciliate, inner bracts gradually longer 3.8–6 mm long, 2–3 mm wide, outer bracts 3–3.5 mm long, 1–2 mm wide. Receptacle conical. Ray florets 15–20, 1-seriate, sometimes 2-seriate, ligules bluish purple, 6–12 mm long, 2–3 mm wide. Disc florets 4 mm long, 5-lobed, yellow, 4.5 mm long. Pappus reddish, 0.3–0.5 mm.
• Achenes dark brownish, obovate, compressed, 1.2–2.5 mm long, 0.5–0.8 mm wide, sparsely pubescent, with sparse sessile glands apically.
• Chromosome number, 2n = 108 (Gu, Cathaya 1: 5. 1989).

物候

Fl. Dec-Apr.

分布

• 台灣 : grassy slopes near seaside, often in cemeteries.
• 世界 : Central to southeast China.

引證標本

HSINCHU: Shimada 2664C (TYPE!). MIAOLI: Tunghsiao, Tamura & Koyama 23106; Yuanli, Peng 11101.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 861. 1998.  (Fl. Taiwan 2nd edit.)