生活型

herb

形態特徵

• Perennial with very short rhizome; culms densely tufted, 10-60 cm by 0.8-1.3 mm, sharply 4-anglular, strongly ribbed, smooth, glabrous, glaucous-green, clothed at base with 2-4 bladeless sheaths.
• Leaves bladeless or uppermost with a very short, lanceolate blade; basal sheaths 1-15 cm long, tightly surrounding clum, membranaceous, rusty brown below, yellowish brown above, obliquely truncate at orifice; ligule absent.
• Inflorescence a single, terminal spikelet; involucre bract 0-1, glume like, inconspicuous. Spikelet erect, broadly ellipsoidal to ovoid-ellipsoidal, 5-12 mm by 4-6 mm, rounded, yellowish to dark brown, densely many-flowered.
• Glums many per spikelet, spiral, oblong-elliptic, 3.5-5 mm long, membranaceous, yellowish brown and often tinged with dark brown, finely many-veined, keel with mor prominent 3 nerves. Stamens 1-3; anthers 1.2-1.5 mm long. Sstyle flat, sparsely ciliate on edges, gradually dilated to base, which is nearly as wide as achene; stigmas 2-3, recurved. Achenes oblong, 1.5-2 mm by 0.3-0.5 mm, biconves or subterete, stiptate, maturing pale-brownish, finely cancellated with isodiametrical hexagonal cells; gynophore spongious, 0.3-1 mm long.

分布

• 台灣 : sporadically occurring in marshy places.
• 世界 : Tropical Asia and Australia.

引證標本

TAOYUAN: Taoyuan, Sasaki s. n. HSINCHU: Chureki, Shimada 2699.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 277. 2000.  (Fl. Taiwan 2nd edit.)