膜果泽泻 mo guo ze xie

Alisma plantago-aquatica Linnaeus var. lanceolatum (Withering) Lejeune.

Tubers 1-2 cm in diam. Aerial leaves with petiole 13-25 cm; leaf blade lanceolate to broadly lanceolate or elliptic, 9-13 × 2.5-5 cm, sometimes larger, 5-7-veined, base cuneate, apex acute to acuminate. Panicles 15-45, in 3-6 whorls of 3-6 branches. Pedicel 1.5-2.5 cm. Sepals broadly ovate, 1.5-3.2 × 2-2.5 mm. Petals white or pinkish, suborbicular, 4-6.5 mm, larger than sepals, margin irregular. Anthers elliptic or oblong, 1-1.2 mm. Carpels regularly arranged; styles ± erect, 0.6-1 mm, equaling or shorter than ovary, stigmatose in upper 1/3-1/2 of their length. Achenes obovoid, 1.6-2(-3) mm, 1-grooved abaxially; lateral pericarp translucent, thin. Fl. and fr. Jun-Sep. 2n = 24, 26, 28.

Margins of lakes, marshes, channels, slow-moving rivers. Heilongjiang, Jilin, Liaoning, Nei Mongol, Shaanxi, Xinjiang, Yunnan [Afghanistan, Kazakhstan, Kyrgyzstan, Pakistan, Tajikistan, Uzbekistan; N Africa, SW Asia, Australia, Europe].