Hydrocotyle americana L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems very slender, creeping; lvs orbicular to broadly ovate, 1–5 cm wide, shallowly 6–10-lobed; umbels sessile or subsessile, 2–7-fld, the pedicels under 1 mm; fr 1.5 mm wide, the dorsal surface acute, the dorsal and lateral ribs acute. Moist low ground; Nf. and Que. to Wis., s. to N.C., W.Va., and Ind. June–Sept.