生活型

herb

形態特徵

• Stems erect, 40-80 cm long.
• Leaves erect, longer than stem, 4-10 mm wide, keeled.
• Spikes erect, lower bracts about as long as spike. Staminate heads 4-7, perianth-scales 6, membranaceous, ca. 2.3-3 mm long, 1.4-2 mm wide; filaments ca. 4-4.5 mm long; anthers oblong. Pistillate heads 4-7, relatively widely separated, usually sessile or lowest pedunculate, 2-2.5 cm in diam.; ovary 1-celled; styles simple, ca. 2 mm long; stigmas oblong, beak-like.
• Fruit rhombic-ovoid, ca. 5 mm long, 2 mm in diam.

分布

• 台灣 : emergent aquatic on lake shores in the east.
• 世界 : China and Japan.

引證標本

HSINCHU: Yuanyang Lake. Hsu 2683 & 3021.

參考文獻

• YANG, Yuen-Po and HSU, Kuo-Shih, Flora of Taiwan, second edition 5: 702. 2000.  (Fl. Taiwan 2nd edit.)