生活型

shrub

形態特徵

• Perennial, erect shrubs to 1-3 m. Stem with scattered hairs, young branches densely tomentose.
• Leaves simple, opposite; petiole 1-1.5 cm, puberulent; blades elliptical to oblong, 6-18 cm long, 1.5-6 cm wide, acuminate at apex, base often obtuse, margins serrate, veins pinnate, puberulent on both surfaces.
• Inflorescences corymbose bostryx, terminal; heads sessile. Involucral bracts 6-9, elliptic to ovate, imbricate, cylindric, in 3-4 series, persistent. Florets 10-12 per head, monoecious, male florets central, 6-8, corolla white, tube narrow, 5-lobed, tomentose apically, anthers 5, black, filaments slender, free, style of sterile pistil slender; female florets marginal, 3-4; corolla white, tube elongate and narrow, 5-lobed, glabrous. Ovary pubescent apically, style branchs ascending.
• Fruit a fleshy cypsela, trianguloid, villous above.

分布

• 台灣 : at open forest margin, ca. 540 m altitude, in Nantou county
• 世界 : native to the tropical America and introduced to Borneo, Java, Sumatra, and Mauritius.

引證標本

Nantou county. Puli, Liyutan, elev. ca. 540 m, on the roadside, 18 Nov. 1997, Tseng 1198 (TESRI); same loc., 25 Nov. 1998, Tseng 2043 (TESRI); same loc., 22 Jun. 1998, Wang 2898 (TNM); same loc., 16 Jul. 1998, Wang 2960 (TNM); same loc., 30 Apr. 1999, Wang 3360 (TNM); same loc., 9 Feb. 2000, Peng 17927 (HAST); same loc., 20 May 2004, Tseng 3733 (TCF); same loc., 10 Jul. 2007, Tseng 4053 (TCF).

引用文獻

• Yen-Hsueh Tseng, Chiu-Mei Wang and Ching-I Peng, Taiwania 53(1): 103-106. 2008.