小掌叶毛茛 xiao zhang ye mao gen

Herbs perennial, subaquatic. Roots fibrous, subequally thick. Stems elongated, glabrous or appressed puberulent above, short branched, often rooting at nodes. Stem leaves with petiole 0.5--2 cm, glabrous or sparsely puberulent; blade 3-partite near base, orbicular-reniform or cordate-pentagonal, 0.4--1 × 0.6--1.7 cm, herbaceous, subglabrous or abaxially sparsely appressed puberulent, base cordate, central lobe cuneate-rhombic, 3-lobed; lateral lobes obliquely obovate or obliquely flabellate, unequally 2-partite, ultimate lobules narrowly ovate or linear-lanceolate. Monochasium terminal, 1--4-flowered; bracts subsessile, leaflike or undivided, narrowly ovate, 0.5--7 mm. Flowers 0.4--0.9 cm in diam. Pedicel to 3.5 cm, glabrous or sparsely puberulent. Receptacle sparsely puberulent. Sepals 5, ovate-elliptic, 2.2--3 mm, glabrous. Petals 5, narrowly obovate or obovate, 2.2--4 × 1.5--2.5 mm, nectary pit without a scale, apex rounded. Stamens 12 or numerous; anthers ellipsoid. Aggregate fruit subglobose, 3--4 mm in diam.; carpels numerous. Achene broadly ellipsoid or obliquely obovoid, 1--1.3 × 0.8--1 mm, glabrous, margin with corky thickening; style persistent, ca. 0.3 mm. Fl. Jun--Aug, fr. Sep.

Streams, moist places by streams, meadows. Heilongjiang, Jilin, NE Nei Mongol [Japan, Mongolia, Russia (Siberia); N Europe].