Ranunculus repens is a perennial herb, stems creeping, hairy, rooting at nodes.
Leaves alternate, stalked; blade 3-parted, leaflets egg-shaped to widest above middle, sharply lobed and toothed, terminal leaflet to 6 cm long, stalked, dark green, often mottled with white.
Flowers bright yellow, petals 5-9, rounded, to 0.8-1.7 cm long, to 1.5 cm long; blooming May-July. Pollinated by insects (Lovett-Doust et al. 1990).
Fruit a round head of dry achenes to 1 cm wide, achenes ca 0.3 cm, somewhat flattened, beaked. Sept.
Wetland status: FAC.
Frequency in NYC: Very infrequent.
Habitat: Open areas, moist roadsides, lawns, meadows.
Notes: Contains the toxic oil protoanemonin (Kingsbury 1964).