北京水毛茛 bei jing shui mao gen

Ranunculus pekinensis (L. Liou) Luferov.

Herbs perennial, submersed. Stems 30 cm or more, branched, glabrous or sparsely puberulent on nodes. Petiole 3.5--14 mm, glabrous or sheath abaxially sparsely puberulent, base narrowly vaginate; leaf blades dimorphic: submerged blades finely 3 or 4 × divided with filiform segments; floating leaves flabellate or broadly cuneate, 1--3 × 1.2--3.5 cm, glabrous, 3-partite or 3-sect, segments 1--3(--4) × partite, ultimate lobules lanceolate-linear. Flower 1--1.3 cm in diam. Pedicel 2--4 cm, glabrous. Receptacle conical in flower and fruit, puberulent. Sepals 5, ovate-elliptic, 3.5--4 mm, glabrous. Petals 5, white with yellow base, obovate, 5--6.5 × 3--5 mm, apex rounded. Stamens 22--25; anthers oblong, ca. 1 mm. Aggregate fruit broadly ovoid, 3--4 × 4--5 mm; achenes obliquely obovoid, 1--1.2 × ca. 0.8 mm, with 7 transverse wrinkles. Persistent style ca. 0.1 mm. Fl. May--Aug, fr. Jul--Sep.

* Streams in valleys; 100--500 m. Beijing.