Ranunculus cymbalaria Pursh
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Glabrous, stoloniferous perennial, 5–15 cm tall; lvs mostly basal; petioles 2–5 cm; blades cordate-ovate to ovate or reniform, 5–25 mm, rounded above, usually cordate below, ± crenate; fls few; pet 3–5 mm, scarcely surpassing the sep; achenes longitudinally nerved, 1.5–2 mm, numerous in a short-cylindric head to 12 mm; 2n=16. May–Oct. In mud, especially in brackish or alkaline places; irregularly distributed throughout much of N. Amer., except se. U.S.; also in Asia. Our plants are var. cymbalaria.