生活型

herb

形態特徵

• A perennial, stout, glabrous, erect herb, 60–120 cm high; lower part of stems with several whorls of fibrous, fascicled roots at the nodes; stems hollow, few branched.
• Leaves oblong to ovate, oblong-lanceolate to linear, 3–10 cm long, 1–3 cm broad. Umbels compound, glabrous; involucres of 5–10-involucral bracts; bracts linear, 0.5–1 cm long, entire or rarely lobed, reflexed; rays 10–20, 2–3 cm long, subequal; involucels 5–10, linear-lanceolate, about 5 mm long.
• Flowers white; calyx-teeth 5, small. Fruit ovoid to globose, 1–3 mm long and broad, the ribs distinct, corky-winged.
• Vittae 1–3 in the interval, 3–4 on the commissure.

分布

• 台灣 : Taiwan, in paddy fields, wet places or along stream banks.
• 世界 : Distributed in North America, eastern Europe, Siberia, northern China, Korea and Japan.

引證標本

TAICHUNG: Chingshui, Yen s. n. 1963. CHANGHUA: Fuhsinggo, Kao 3733*.

參考文獻

• KAO, MUH-TSUEN, Flora of Taiwan, second edition 3: 1040-1043. .  (Fl. Taiwan 2nd edit.)