生活型

herb

形態特徵

• Perennial with long, slender, stoloniferous rhizome terminated by a globose-ovoid tuber. Culms solitary or few together, bearing a corm-like enlargement at base, erect, 10-40 (rarely to 60) cm tall, slender, triquetrous, smooth, leaved at base.
• Leaves few, much shorter than culm; blades linear, 2-5 mm wide, folded; sheaths light brownish, eventually disintegrating into brown parallel fibers.
• Corymbs simple to compound, loose, with 2 to 10 slender rays of unequal length; rays 1-8(-12) cm long, patent; spikes turbinate with rather short rachis, subloosely bearing 3 to 10 spikelets; leafy bracts usually 2 or 3, rarely to 5, lowest 2 to 3 times as long as corymb, second slightly surpassing corymb, remainder bracts setaceous. Spikelets spreading to patent, linear, 1-3 cm long, (1.5-)2-3 mm wide, subcompressed with acute edges, subdensely 8-28-flowered, sanguineous-brown; rachilla with relatively broad, white-hyaline wings.
• Glumes ovate to ovate-elliptic, 3-3.2 mm long, folded with subacute keel, membranaceous, sanguineous- or slightly purplish brown, 5- or 7-nerved with weak lateral veins, apex obtuse or suddenly mucronate, more or less recurved; keel greenish. Achenes oblong, trigonous, 1/3 to 2/5 their length of glume, maturing brown, minutely puncticulate; style elongated; stigmas 3. Stamens 3.

分布

• 台灣 : Common and noxious weed in cultivated grounds, also in open grasslands in hilly countries.
• 世界 : Temperate, subtropical and tropical regions of all the world.

引證標本

TAIPEI: Taipei, Tanaka 11133; Keelung, Sasaki s. n. 17 Sep 1908. MIAOLI: Tahu, Chen 100. YUNLIN: Lunyen, Chuang & Kao 4116; Huwei, Chen & Kao 3060. TAINAN: Chiali, Morimoto 196; Shanhutang, Kuoh 3958. PENGHU: Penghu, Kuoh 1072, Huang & Kao 6844. PINGTUNG: Liuchyuyi, Hosokawa 1542; Hengchun, Wang 12718. TAITUNG: Lanyu Is., Sasaki s. n. 3 May 1927; Green Isl., Huang 6967.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao. 2000. Flora of Taiwan, second edition 5: 250. (Fl. Taiwan 2nd edit.)