生活型

herb

形態特徵

• Rhizome short, robust, densely tufted. Culms erect to ascending, (15-)20-80(-100) cm tall, 1-2 mm thick, trigonous, rigid, scabrid on upper angles.
• Leaves many, overtopping culms, 3-12 mm wide, coriaceous; sheaths rather short, pale with brown or purplish brown nerved.
• Spikes 3-6, upper 2 or 3 contiguous, remainder spaced, or all spikes spaced; terminal spike staminate, cylindrical, 3-7 cm long, 3-6 mm wide, brown; lateral spikes pistillate, occasionally androgynous, 2-6 cm long, 6-8 mm wide, densely many-flowered, erect, peduncled. Lower bracts long-sheathing, blades leafy, much surpassing subtending spike, shorter than inflorescence.
• Pistillate glumes ovate to lanceolate, 4-5 mm long excluding awn, pale to slightly rusty brown, obtuse or shallowly retuse at apex; awn ca. 5 mm long. Utricles equalling glume, patent to spreading, ovoid, 5-6 mm long, swollen-trigonous, many-nerved, glabrous, beak erect, spinulose-margined, deeply 2-cleft, 1-2 mm long, divergent. Achenes rather tightly enveloped, broadly obovoid, trigonous with angles shallowly constricted at middle, abruptly narrowed into a conspicuous, cylindrical long beak; style enlarged at base; stigmas 3, elongated.

分布

• 台灣 : seacoasts of Lanyu Is.
• 世界 : Japan, Korea, the Ryukyus, Bonin Is. and the Pacific island.

引證標本

TAITUNG: Lanyu Is., Kuoh 4929, Kawakami & Mori 2421, Sasaki s. n. 1907.

引用文獻

• KOYAMA, Tetsuo, KUOH, Chang-Sheng & LEONG, Wai-Chao, Flora of Taiwan, second edition 5: 236. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)