生活型

herb

形態特徵

• Perennial herb, rhizome short, ca. 1 cm long, 1 cm wide.
• culms alternate, erect, 30-50 cm tall, cross section deltoid, leaf 1-2, basal, linear, apex acute, boated, margin entire, blade flaten, central vein dominant; bract similar to leaf blade, 3-5.
• Inflorescence a terminal single globose head, ca. 15 mm long and as wide, densely bearing numerous spikelets. Spikelet laterally compressed, 1- floreted; glumes 5, lowest glumes 2, membranous, apex round, ca. 1.5 mm long; abaxial one ellipse, 1-nerved, adaxial one ovate, 3-nerved; middle glumes 2, membranous, ca. 4 mm long, apex acute, one short awn rising from apex, midrib keeled, hispidulate, abaxial one 7-nerved, adaxial one 5-nerved; inner glume 1, linear, apex acute to bifid, membranous, 1-nerved, 3.5-4 mm long; stamen 3, filament membranous, to 6 mm long, anther ca. 2 mm long; ovary ellipsoid, ca. 1.3 mm long, style ca. 2 mm long, stigma bifid.
• Achene obovoid, compressed, glabrous, ca. 1.5 mm long, 0.8 mm wide, 0.5 mm thick, cross section of upper part ellipse, cross section of basal part deltoid.

分布

• 台灣 : in wetlands and waste places in low elevations of northern Taiwan.
• 世界 : native to tropical Africa, and naturalized in Malaysia, Singapore, Australia and Pacific Islands.

引證標本

Taipei City, Daan District, NTU campus, 13 Nov 2007, T.-C. Hsu 1059 (TAI); Wenshan District, Jingmei Stream Riverside Park, 11 Nov 2007, M.-J. Jung 1826 (TAIF). Taipei Co., Sijhih City, Hsinshan-menghu, 13 Jan 2008, M.-J. Jung 2182 (TAIF); Wuku Hsiang, Wuku Wetland, 14 Nov 2007, T.-C. Hsu 1067 (TAIF). Ilan Co., Juangwoi Hsiang, Juangwoi, 14 Nov 2000, C.-C. Lin 49 (TAIF); Suao Town, Suao, 14 Nov 2007, M.-J. Jung 1838 (TAIF). Keelung City, Cidu District, Maling, 15 Feb 2008, M.-J. Jung 2322 (TAIF).

引用文獻

• Ming-Jer Jung, Tien-Chuan Hsu and Shih-Wen Chung, Taiwania 53(2): 230-235. 2008.