生活型

herb

形態特徵

• Annual with fibrous roots; culms densely tufted, 3-10 cm by 0.3-0.5 mm, 3- or 4-angular, smooth.
• Leaves basal, few; blades linear, 1.5-4 cm by 0.3-0.6 mm, acute, flat or carniculate, light green, pilose or glabrescent; sheaths 5-15 mm long, pale green to yellowish brown, pilose; ligule absent.
• Inflorescence compound, or rarely simple, loose, 2-7 cm by 2-7 cm; involucre bracts 2-6, leaf-like, pilose or glabrescent; primary branches 3-7, filiform, patent, 0.5-4 cm long. Spikelets many per inflorescence, solitary, ovate to oblong-oblanceolatel, 2.5-6 mm by 1-1.5 mm, acute, subterete, densely 8-15-flowered.
• Glumes 10-40 per spikelet, spiral, ovate, acute, 1-1.5 mm by 0.6-1 mm, membranaceous, yellowish brown; keel green, finely 3-nerved. Stamen solitary, anthers 0.3-0.5 mm long. Style flat, dilated and glabrous at base, ciliate above; stigmas 2. Achenes obovate, 0.5-0.7 mm by 0.3-0.5 cm, shortly stipitate, yellow at maturity, sometimes slightly shiny, biconvex, smooth or weakly reticulate.

分布

• 台灣 : open wet places.
• 世界 : India, Sri Lanka, Indochina, Malesia, northern Australia, China and Japan.

引證標本

ILAN: Lotung, Kuoh 1721; Kueishan Is., Masamune & Suzuki s. n. TAIPEI: Nankang, Kuoh 2224; Soshan, Umetani s. n. YUNLIN: Huwei, Ashikaga 103. TAINAN: Huanchuten, Morimoto 208. PINGTUNG: Pingtung. Matuda s. n.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 262. 2000.  (Fl. Taiwan 2nd edit.)