生活型

herb

形態特徵

• Aquatic perennials.
• Leaves radical, linear or subspatulate, 8-15 cm long, 4-8 mm wide, entire, apex obtuse, sheathing basally; petiole indistinct.
• Inflorescence racemose; peduncle 10-30 cm long, fewflowered. Flowers in 2 whorls of 3; pistillate flower solitary, sessile, in the lowest whorl; staminate flowers 2-5, on pedicels 10-30 mm long; petals 8-10 mm long; stamens usually 12. Achenes 3 mm long, dorsally cristate, with a broad wing.

分布

• 台灣 : Submersed in paddy fields and ponds in northern and central Taiwan.
• 世界 : China, Korea, Japan and the Ryukyus.

引證標本

TAOYUAN: Taoyuan, Yang 131a; Nanchang, Yang 131b. TAICHUNG: Tachia, Shimada 2929.

參考文獻

• YANG, Yuen-Po, Flora of Taiwan, second edition 5: 7. 2000.  (Fl. Taiwan 2nd edit.)