生活型

herb

形態特徵

• Annuals or perennials, 30-200 cm tall. Stems erect, glabrous, hirsute, or puberulent.
• Leaves mostly cauline, mostly alternate,petioles 1-7 cm, blades deltate-ovate, lance-ovate, or ovate, 2.5-14 × 1.8-13 cm, bases cordate to truncate or broadly cuneate, margins subentire to serrate, abaxially glabrous to hispid, not gland-dotted.
• Heads 1-3. Peduncles 9-30 cm. Involucres hemispheric, 10-22 mm in diam. Phyllaries 20-30, lanceolate, 8-17 × 1-3 mm, apex acute to long-attenuate, abaxially glabrous or hispid, not gland-dotted. Paleae 7.5-8 mm, apically 3-toothed. Ray florets 11-23, corollas yellow. Disc florets ca. 30; corolla 4.5-5 mm, lobes usually reddish, sometimes yellow; anthers dark brown, appendages dark brown; style branches usually reddish, rarely yellow. Cypselas 5-12 mm long, glabrous or sparsely hairy; pappus of 2 lanceolate or lance-linear awns 1.2-2.5 mm long.

分布

• 台灣 : naturalized for at least a decade in open areas, at about 5-10 m above sea level, through the coast of Changhua County.
• 世界 : native to North America, including Connecticut, Florida, Georgia, Louisiana, Maryland, Massachusetts, Michigan, New Hampshire, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Texas, Vermont, Virginia, and West Virginia, and naturali

引證標本

Changhua County. Lukang Town, Wangyetsuo, elev. ca. 10 m, at roadside, 16 Sep. 1999, Y.H. Tseng 2284 (TCF); Shenkang Township, Chuanhsing, elev. ca. 5 m, near seashore, 22 Aug. 2007, Y.H. Tseng 4061 (TCF); Fangyuan Township, Wangkong, elev. ca. 10 m, at roadside, 2 Nov. 2007, Y.H. Tseng 4087 (TCF); Fuhsing Township, Changbin Industrial Area, Lukong South Road, elev. ca. 5 m, open waste roadside, 12 May 2000, C.H. Lin 299 (HAST).

參考文獻

• Yen-Hsueh Tseng, Ching-Yu Liou ang Ching-I Peng, Taiwania 53(3): 316-320. 2008.