Stems prostrate and creeping, to 1 m; principal lvs long- petioled; lfls 5 or 7, obovate or oblong-obovate, the median 2-5 cm, the lateral progressively shorter, all crenate; fls solitary (2) from the axils, long-pedicellate, yellow, 18-25 mm wide; bractlets often exceeding the sep; anthers 1.3-2.0 mm; 2n=28. Native of Eurasia, intr. in lawns, roadsides, and waste places; N.S. to O. and Va. June-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.