生活型

herb

形態特徵

• Annual or short-lived perennial, tufted without conspicuous rhizome. Culms erect, 10-50 cm tall, 1-2 mm thick, obtusely trigonous, rather rigid, whitish or glaucous green.
• Leaves basal, several to a culm, much shorter than culm; blades linear, 2-3 mm wide, flattish or involute-margined, thickish, soft, without, conspicuous nerves, not costate, whitish green, glabrous, gradually tapering to subobtuse apex; sheaths 2-3 cm long, pale straw colored. Leafy bracts 2-4 much surpassing inflorescence, patent, eventually more or less reflexed.
• Inflorescence a head with (3-)4-7 sessile spikes, 1-2 cm across; spikes ovoid to ovoid-ellipsoid, obtuse, 5-8 mm long, 4-5.5 mm wide, whitish greenish or whitish, densely bearing numerous glumes, each subtending a hidden spikelet.
• Glumes imbricated, oblanceolate, subtruncate at apex with depressed-triangular apex, 2-3 mm wide, 1-keeled. Spikelets with dorsiventral hyaline glumes, ca. 2 mm long, 1-fruited. Achenes oblong to oblong-obovate, ca. 1 mm long, strawbrown; style short; stigmas 2, short. Stamens solitary, rarely 2.
• This fairly common species, known also from south continental China and the Ryukyus, is documented for Taiwan only by a single collection cited above.

分布

• 台灣 : Open wet places such as marshes, river banks and rice field.
• 世界 : Widely distributed in the Old World tropics from Africa and Madagascar through India to Malesia.

引證標本

NANTOU: Sun Moon Lake, DeVol 7848. TAITUNG: Taitung, Matsumura (TI).

引用文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 287. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)