生活型

herb

形態特徵

• Perennial with small corm like rhizome. Culms solitary or few together, often rather slender, 35-100 cm tall, triquetrous, thickened at base.
• Leaves shorter than culm; blades linear, 4-6 mm wide, weakly folded, herbaceous; sheaths rather elongated, light brown.
• Corymb compound to decompound; leafy bracts 4-6, lower 2 or 3 surpassing corymb; rays 5-10, unequal, 1-15 cm long, patent; secondary corymbs with short raylets or bearing 4-8 subsessile spikes. Spikes loose, broadly ovate in outline, distantly bearing 8-20 spikelets. Spikelets divergent, linear, 8-40 mm long, 0.8-1 mm wide, cylindrical, 8-to 32-flowered.
• Glumes distantly disposed on weakly zigzag rachilla, elliptic, 1.8-2 mm long, obtuse at apex, membranaceous, sanguineous brown on both sides, 3- to 5-nerved near keel, white-hyaline on upper margin, keel greenish hardly reaching glume apex, base decurrent along rachilla forming caducous white-hyaline wings. Achenes oblong to oblong-elliptic, trigonous, ca. 2/3 as long as glume, maturing dark brown, minutely punctulate; style short; stigmas 3. Stamens 3.

分布

• 台灣 : Both wet and dry places at low altitudes, frequently seen in rice fields.
• 世界 : Pantropic.

引證標本

NANTOU: Chitou, Kuoh 3929; Tuchen, Kuoh 3853. TAINAN: Tainan, Nagasawa s. n. (KYO). KAOHSIUNG: Nanhen, Kuoh 4098; Shanping, Kuoh 3979. PINGTUNG: Nanjenshan, Kuoh 4117. ILAN: Lotung, Kurosawa, s. n. (KYO).

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 242. 2000.  (Fl. Taiwan 2nd edit.)