长叶水毛茛 chang ye shui mao gen

Ranunculus kauffmanii Clerc, Zap. Ural’sk. Obshch. Lyubit. Estestv. 4: 107. 1878.

Herbs perennial, submersed. Stems ca. 25 cm, branched, glabrous. Petiole 5--12 mm, glabrous, base broadly vaginate; leaf blade flabellate in outline, 3--6 × 3--7 cm, glabrous, 3-sect; segment 3--4 × sect; ultimate lobules filiform, soft, collapsing out of water. Flower 0.8--1 cm in diam. Pedicel 2--9 cm, glabrous. Receptacle conical in flower and fruit, glabrous. Sepals 5, elliptic, ca. 3 mm, glabrous. Petals 5, white with yellow base, apex rounded. Stamens ca. 11; anthers oblong, ca. 0.8 mm. Aggregate fruit subglobose, ca. 4 mm in diam.; achenes obliquely narrowly obovoid, ca. 1.5 × 1 mm, glabrous, with 6 or 7 transverse wrinkles. Persistent style ca. 0.1 mm. Fl. Jun--Sep, fr. Jul--Oct.

Streams, rivers, swamps; ca. 900 m. Heilongjiang, E Jilin, Nei Mongol [Mongolia, Russia (Far East, Siberia); Europe].