生活型

herb

形態特徵

• Perennial herbs from a long deep tap-root. Stems erect, grooved, 40–110 cm tall, with stiff spreading-ascending branches, hirsute or nearly glabrous.
• Lower leaves oblanceolate, petiolate, toothed or more often pinnatifid, 8–25×1–7 cm, becoming reduced, sessile, and entire or toothed upwards.
• Heads 2.5–4 cm across, terminal on somewhat thickened stalk and in subsessile clusters of 2 or 3 in axils of upper leaves. Flowers large, bright blue, pink or rarely white. Involucre green, 9–15 mm long, outer bracts ca. 8, inner bracts ca. 5, twice as long as outer.
• Achenes 2–3 mm long, minutely cross-rugulose, unequally several-nerved, broadly rounded on back; pappus of many minute, fimbriate scales.
• Chromosome number, 2n = 18.

分布

• 台灣 : introduced concomitantly with seeds of <i>Trifolium alexandrinum</i> L. and naturalized in pastures at low elevations (Peng, 1978).
• 世界 : Native of northern Europe, widely naturalized in North America.

引證標本

TAOYUAN: Taiwan Livestock Research Institute, Yangmei Branch, Peng 3145. TAINAN: Taiwan Livestock Research Institute, Hsinhua, Peng 3162.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 903. 1998.  (Fl. Taiwan 2nd edit.)