生活型

herb

形態特徵

• Stems 20–90 cm long, stout, pubescent, branched.
• Median cauline leaves chartaceous, ovate-deltoid, 9–25 cm long, apex acute, base shallowly cordate to broadly cuneate, margins irregularly dentate, often obsoletely 3-lobed, densely scabrous on both surfaces; petiole 3.5–10 cm long, not winged.
• Heads monoecious. Staminate heads in terminal umbels, involucral bracts in 1 series, oblong-lanceolate, 2.2 mm long; outer paleae oblong-lanceolate, inner paleae lanceolate, 2.2 mm long; corolla white, tubular, 2.5 mm long, 5-dentate. Pistillate heads axillary, involucral bracts in 1 series, oblong-lanceolate, 3 mm long, inner bracts connate with outer paleae. Utricles sessile, oblong, ellipsoid or ovoid, 10–18×6–12 mm, densely puberulent, 2-beaked, prickles 1.5–2 mm long.

分布

• 台灣 : river banks, seacoasts, and waste fields throughout the lowland.
• 世界 : Eurasia and North America.

引證標本

TAIPEI: Nankang, Wang 717. HSINCHU: Lienhuassu, Wang 629; Chutung, Leu 529. MIAOLI: Tonghsiao, Peng 5445; Houlong, Peng 11580. TAICHUNG: Taan, Hsiao 1341. CHANGHUA: Hanpao, Yen 10203. NANTOU: Lienhuachih, Wu 47. TAINAN: Paiho, Yen 8867; Kantoushan, Peng 7087. PENGHU: Hsiyu Is., Yang 4854; Fengkuei, Loa 11. PINGTUNG: Maopitou, Peng 12535; Mutan, Wang 2102.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1098. 1998.  (Fl. Taiwan 2nd edit.)