生活型

herb

形態特徵

• Glabrous annuals.
• Radical leaves rosulate, long petiolate, oblanceolate-oblong, 5–10×1.4–2.5 cm, lyrate-pinnatisect, terminal segment rounded, remotely dentate, mucronulate at apex, lateral lobes gradually smaller toward base, 1–3 pairs, spreading, ovate to oblong, mucronulate at apex; petiole narrowly winged. Scapiform stems slender, stoloniferous, ascending, once branched, to 15 cm long (including peduncle), with or without leaflets, peduncle 1.5–5 cm, with linear-lanceolate bracts at base, bracts 2–3 mm long.
• Heads 1 cm across; involucral bracts of 2-series, outer bracts 5, ovate, 1–1.5×1 mm, green flushed with purple at apex, scarcely pubescent; inner bracts 5, oblong, 4.5–5×1–1.2 mm, scarcely pubescent. Florets 8–10, yellow, 4–5×1.5–2 mm, 5-lobed; style to 4 mm, stigma bifid, ovary 0.8 mm long.
• Achenes 6 or 7, light brown, oblong, 3-sided, ribbed, 4 mm long, 1 mm thick, toothed at apex.

物候

Fl. Nov-May.

分布

• 台灣 : in paddy fields, not common.
• 世界 : Korea, Japan and central China.

引證標本

MIAOLI: Yuanli, Peng 10537. HUALIEN: Chen 3611.

引用文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1008. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)