生活型

herb

形態特徵

• Perennial, densely tufted often in large clumps with short, inconspicuous rhizome. Culms slender, rigid, erect, 10-50 cm tall, obtusely trigonous, smooth.
• Leaves few, shorter than culm; blades slenderly linear, 1-2 mm wide, flattish plicate; sheaths rather elongated, tinged with reddish brown.
• Corymbs as a rule simple with 1-6 unequal rays, at times congested in a headlike clusters of spikelets; rays slender, longer ones to 7 cm long; spikes with short rachis, or nearly becoming a subglobose cluster of spikelets in upper part; leafy bracts 2-4, lowest 1 or 2 surpassing corymb. Spikelets linear-lanceolate or linearoblong, strongly flattened, 6-20 mm long, 1.5-3 mm wide, densely 12-44-flowered, reddish brown, purplish brown or dark reddish brown; rachilla tetragonous.
• Glumes ovate-oblong, 1.5-2 mm long, obtuse at apex, 3-nerved, pale brown, reddish brown or dark purplish brown, pale on margins, greenish keel prominent. Achenes obovate, lenticular, laterally flattened, ca. 1/3 as long as glume, maturing dark brown, minutely punctulate; style of medium length; stigmas 2. Stamens 2.

分布

• 台灣 : Common in wet places; in Taiwan often seen on margins of rice fields.
• 世界 : Widely distributed from the Mediterranean region and South Africa through Central Asia and Indian subcontinent northeastwards to China and Japan.

引證標本

TAIPEI: Tuchen, Sasaki s. n. 19 Jun 1931; Hsinpeitou, Chuang & Kao 2943; Tamshui, Hsu 11223; Shulin, Tanaka 11107; ILAN: Lotong, Yamamoto 2587 & 2651. TAOYUAN: Chongli, Shimada 311; Kweishan, Suzuki 5784. MIAOLI: Tahu, Chen 56. NANTOU: Tuchen, Kuoh 3857. YUNLIN: Huwei, Ashiri 2464, Ashikaga 71. TAINAN: Sanhutan, Kuoh 3961; Chiali, Morimoto 203. PINGTUNG: Kenting, Kao 4217; Lyukyuyi, Hosokawa 1539; Wanten,Yamamoto & Mori 7631. TAITUNG: Lanyu Is., Sasaki s. n. 15 Jun 1926. HUALIEN: Yuli, Suzuki 5331; Su, Yamamoto & Mori 7196.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 292. 2000.  (Fl. Taiwan 2nd edit.)