生活型

herb

形態特徵

• Slender annuals, without rhizomes.
• Culms densely tufted, filiform, 5-35 cm tall, 0.2-0.5 mm thick, leaves basal, filiform, 2-10 cm long, soft, light green, glabrescent or sparingly pilose on lower surface; sheaths pale.
• Involucral bracts sectaceous or scale like, much shorter than corymb. Corymbs simple or compound; rays 1-5, capillary, 2-5 cm long. Spikelets (1-)2-8, oblong-ovoid to ovoid, 3-6 mm long, 1.5 mm wide, chestnut brown.
• Glumes 5-18 per spikelet, ovate, 1.5-2 mm long, apex mucronate, keel acute. Stamens 2. Style base depressed bulbose. Achenes obovoid-orbicular, trigonous, 0.8 mm long, grayish, inconspicuously undulate-corrugate, irregularly puncticulate.

分布

• 台灣 : cultivated fields and wasteland.
• 世界 : Paleotropical and subtropical

引證標本

ILAN: Nanshan, Kuoh 3113. TAICHUNG: Chika, Huang7082. HUALIEN: Tayuling, Hsu 3780.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 194. 2000.  (Fl. Taiwan 2nd edit.)