八药水筛 ba yao shui shai

Vallisneria octandra Roxburgh, Pl. Coromandel 2: 34. 1802; Blyxa roxburghii Richard, nom. illeg. superfl.; B. saivala Steudel, nom. illeg. superfl.

Stems shortened or absent. Leaves all in basal rosette, linear, 6-60 cm × 5-7 mm, veins faint, 20 or more, spiny toward apex. Spathes 6-10 cm, with a long peduncle 20-120 cm. Plants dioecious; flowers unisexual, 1 female or 5-10 male flowers in a spathe. Sepals reddish, linear, 9-10 × ca. 1.5 mm. Petals 2-2.5 cm or longer. Stamens 9; filaments 2-5 mm; anthers 1-2 mm. Ovary narrowly cylindric, 6-9 cm, with a beak 8-10 cm; styles ca. 2 cm, hairy. Fruit 7.5-10 cm. Seeds numerous, oblong-elliptic, 1-2 × 0.5-1 mm, with up to 12 longitudinal ridges bearing 8 rows of ± blunt spines ca. 0.5 mm, without filiform projections. 2n = 16, 32.

Guangdong, S Guangxi (Fangcheng), Sichuan, Yunnan [Bangladesh, India, Myanmar, New Guinea, Sri Lanka, Vietnam; Australia].