生活型

herb

形態特徵

• Tufted in clumps without conspicuous rhizome. Culms 15-70 cm tall, 1-4 mm thick, subterete or obtusely several angled, light green, dull, clothed at base with few sheaths only.
• Sheaths 3 or 4, lower ones scale like, brownish, upper ones 5-15 cm long, pale-green, obliquely truncate at mucronate orifice.
• Inflorescence a pseudo-lateral head with (1-)2-9(-12) spikelets; bract 5-15 cm long, rather suddenly subacute at apex, 1-furrowed on ventral side, dilated at base. Spikelets oblong to ovoid-oblong, 6-18 mm long, 3-6 mm wide, straw-colored, rather suddenly contracted to subobtuse apex, densely many-flowered.
• Glumes oval to ovate-oval, 3-4 mm long, 1.8-2.7 mm wide, thickly membranaceous, pale and brown-tinged, apex rounded to shallowly emarginate and mucronate, keel broad, green 1- or 3-nerved. Achenes broadly obovate, unequally biconvex, 1.8-2 mm long, 1.5 mm wide, suddenly contracted to cuneate base, rounded to mucronate apex, side maturing dark brown, shiny, transversely wrinkled; style 2-2.2 mm long, somewhat flattened; stigmas 2, occasionally with a rudimentally third one. Hypogynous bristles 4-6, retrorsely scabrous except at base, 4 as long as or slightly surpassing achene, remainder 1/2 as long as achene or shorter.

分布

• 台灣 : Wet places, often seen in rice fields.
• 世界 : From Japan southwards to Malaysia, southwestwards to India and Sri Lanka, and disjunct to Hawaii and Fiji.

引證標本

TAIPEI: Taipei, Suzuki 7785; Chilian, Suzuki 20585; Shihmen to Yehliu, Hsu 3853; Fuloong, Kuoh 4154. TAICHUNG: Tarao, Asikawa 560. NANTOU: Sun Moon Lake, Hsu 12441; Neihuko, Liu 1029; Chichi, Kao 3922. KAOHSIUNG: Fengshan, Chuang 4142. PINGTUNG: Pingtung, Matuda 421; Nanjenshan, Kuoh 13163. TAITUNG: Taitung, Kobayashi s. n. Apr 1906.

參考文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 300. 2000.  (Fl. Taiwan 2nd edit.)