生活型

herb

形態特徵

• Perennial herb, wholly light green. Culms solitary, erect from horizontally creeping rhizome, 50-100 cm tall, 6-9 mm thick below, 5-angular, several-nodose, glabrous except below inflorescence.
• Basal leaves reduced to subaphyllous sheaths; bladed leaves 5 to 7 to a culm, spaced on middle and upper part of culm; blades lanceolate to linear-lanceolate, 10-20 cm long, 5-15 mm wide, 5-costate, glabrous, briefly acute at apex, suddenly contracted at base, sheaths 2-5 cm long, tightly surrounding culm.
• Inflorescence paniculiform, with 3 to 12 glomerulous clusters of spikelets; glomerules single or binate, 15-20 mm across, bearing 5 to 10 spikelets, peduncles white villose, single or binate, occasionally branched; bracts leaf like, longer than partial inflorescence. Spikelets ovoidal or ovoid-ellipsoid, 4-7 mm long, brownish green or dark brownish green at maturity, acute, wholly covered with woolly hairs.
• Glumes elliptic, 2 mm long, ciliate and sparsely pilose outside, midvein ending in a short recurved awn ca. 1 mm long. Achenes broadly obovate, 0.8 mm long, subobtusely triquetrous with obscurely wrinkled sides, cuneate base with a thickish style; style 3-fid. Hypogynous bristles none. Hypogynous squamellae 3, obovate or oblong, membranaceous, short-stipitate at base, slightly surpassing achene.

分布

• 台灣 : Wet places, frequently seen in rice fields.
• 世界 : Widely distributed in the tropics of both hemispheres.

引證標本

TAIPEI: Peitou, Faurie 52, Murakami 38; Shihpai, Suzuki 20583. NANTOU: Sun Moon Lake, Kudo & Sasaki 15380, 15501. TAOYUAN: Taoyuan, Suzuki s. n. 1 Nov 1925. KAOHSIUNG: Fungshan, Chuang 4150. PINGTUNG: Shimo Tansuikei River, Miki s. n.; Nanjenshan, Matuda s. n. Jul 1919; Changlo to Nanjenshan, Wang 12748. TAITUNG: Kwanou, Sasaki s. n. 8 Aug 1920.

引用文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 282. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)