Sagittaria trifolia L.

Aquatic, glabrous herb with thick stolons bearing tubers at tip. Leaves mostly emerged, upright, sagittate or somewhat hastate, blade ovate or linear-lanceolate and acute; basal lobes triangular or linear-lanceolate, often longer than the blade, sharply acute. Petiole 60-75 cm long, triangular. Inflorescence an unbranched scapose raceme, 30-50 cm long. Flowers in 2-6 whorls of (2-) 3 (-5) flowers each, unisexual, 1-2 cm across, white. Pedicels 8-15 mm long, short in females; bracts triangular-ovate, acute-acuminate. Sepals elliptic, somewhat keeled, margins broadly membranous, reflexed in fruit. Petals broadly elliptic-suborbicular, white, without basal purple spot. Stamens c. 20, filaments lanceolate, 1.5-2 mm long; anthers yellow, oblong, as long as the filaments. Head of achenes subglobose, c. 1 cm across; achenes triangularly obovate, with laterally bent beak. c. 2-3 mm long, wings subcrenate to entire.

Range Description: This species is widespread from south European Russia to Japan and Malaysia as well as in several provinces of China. Countries - Native: Afghanistan; Cambodia; China (Anhui, Beijing, Chongqing, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shandong, Shanghai, Shanxi, Sichuan, Tianjin, Xinjiang, Yunnan, Zhejiang); Hong Kong; India (Assam); Indonesia (Sulawesi, Sumatera); Iran, Islamic Republic of; Japan; Kazakhstan; Kyrgyzstan; Lao People's Democratic Republic; Macao; Malaysia; Myanmar; Nepal; Philippines; Russian Federation (Amur, Buryatiya, Chita, Khabarovsk, Krasnoyarsk, Primorye, South European Russia); Taiwan, Province of China; Thailand; Turkmenistan; Uzbekistan; Viet Nam