生活型

herb

形態特徵

• Perennial. Rhizome short creeping, woody. Culms slender to rather robust, loosely tufted, erect to scrambling on bushes, 60-200 cm tall, 3-6 mm thick, glabrous to pubescent, scabrous on angles.
• Leaves rather many, 4-20 mm wide, herbaceous to slightly coriaceous, glabrous, scabrous on margins and alone costas, gradually narrowed into a very long apex; sheaths trigonous, narrowly to broadly winged, scabrous on angles; contraligule dark brown, round to somewhat depressed, ciliate to pubescent on margin.
• Inflorescence consisting of 2-4 compound panicles, 10-50 cm long; panicles single, peduncles ascending, scabrous, long-exserted to 20 cm long; lowest bracts slightly surpassing inflorescence. Spikelets unisexual or gynodioecious, purpurish to dark brown, single or in clusters of 2-3; pistillate spikelets broadly ovoid, 3.5-5 mm long. Staminate spikes lanceolate to oblong, 3-4 mm long.
• Achene globose to ovate, 2-3 mm in diam., terete to obtusely trigonous, white to slightly grayish, shining, smooth to cancellate, pubescent between lacunae; hypogynium shallowly 3-lobed, lobes appressed to achene, ovate to broadly ovate, obtuse or minutely dentate at apex.

分布

• 台灣 : in wet place alone forest margin and thickets at low altitude, common.
• 世界 : Widely distributed in tropical and subtropical Asia, from India, Sri Lanka, China, Japan, southeastern Asia and Australia.

引證標本

Taipei: Nankang, Chuang 4659; Chiayi: Chukou, Kuoh 4505; Pingtung: Nanjenshan, Li 227.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 313. 2000.  (Fl. Taiwan 2nd edit.)