无尾水筛 wu wei shui shai

Blyxa ecaudata Hayata.

Stems shortened. Leaves all in basal rosette, linear, 5-17(-60) cm × 3(-12) mm, veins 5-9, apex acuminate. Spathes green, 3-5 cm × ca. 2 mm, with peduncle 2.7-8 cm. Flowers bisexual. Sepals greenish purple, linear-lanceolate, 5-7 × ca. 1 mm. Petals 9-17 × ca. 0.5 mm. Stamens 3; filaments 3-6 mm; anthers 1-1.8 mm. Ovary narrowly cylindric, 2.5-4 cm; styles ca. 7 mm. Fruit (2-)4-6(-8) cm. Seeds 30-70, oblong-ovoid, 1.2-1.8 × ca. 0.6 mm, 6-12-ribbed; ribs obscurely tuberculate or ridged. Fl. and fr. May-Sep. 2n = 16.

Paddy fields and channels. Fujian, Guangdong, Guangxi, Hainan, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Bangladesh, Bhutan, India, Indonesia, Japan (Ryukyu Islands), Korea, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; Africa, Australia; introduced in North America].