Emersed lvs ovate-oblong in outline, 1.5-3 cm, deeply pinnatisect, the rachis scarcely wider than the 6-12 pairs of lateral segments; fr 2.5-4 mm wide, irregularly ridged, obtusely angled with nearly flat sides; otherwise much like no. 1 [Proserpinaca palustris L.]. Sandy bogs of the coastal plain; N.S. to Fla. and La. June-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.