Ranunculus japonicus Thunberg var. smirnovii (Ovczinnikov) L. Liou.

Herbs perennial. Roots fibrous, subequally thick. Stems ca. 50 cm, densely spreading hirsute, branched. Basal leaves ca. 10; petiole 10--20 cm, densely spreading hirsute; blade 3-lobed, cordate-pentagonal, 5--10 × 7--13 cm, papery, abaxially puberulent, base cordate, margin incised-dentate; central lobe rhombic or broadly rhombic, acute, 3-lobed, incised-dentate; lateral lobes obliquely flabellate, unequally 2-cleft slightly beyond middle. Lower stem leaves similar to basal ones; upper stem leaves subsessile or sessile, 3--5-sect, segments oblong-rhombic. Compound monochasium terminal, ca. 10-flowered; bracts leaflike, 3-sect. Flowers 1.6--1.8 cm in diam. Pedicel 1--4 cm, densely appressed puberulent. Receptacle glabrous. Sepals 5, elliptic-ovate, 4--5 mm, abaxially appressed puberulent. Petals 5, broadly obovate, 8--10 × 7--8 mm, nectary pit covered by a scale, apex rounded. Stamens numerous; anthers oblong. Aggregate fruit subglobose, ca. 5 mm in diam.; carpels numerous. Achene obliquely obovate, ca. 2 × 1.8 mm, glabrous, narrowly marginate; style persistent, ca. 0.3 mm. Fl. Jul--Aug.

Meadows, forests. NE Nei Mongol [Russia (E Siberia)].