From Flora of Indiana (1940) by Charles C. Deam
This is a small prostrate species restricted to the beach of Lake Michigan.
Prostrate, usually divergently branched or forming mats, glabrous throughout; lvs opposite, linear-oblong to lance-oblong, mostly 8-15 mm, entire, slightly inequilateral at base; appendages very small or none; fr 3-3.5 mm; seeds plump, smooth, compressed- ovoid, gray, 2-2.6 mm. Sand dunes and sandy beaches of the Atlantic from Que. to Ga., and of the Great Lakes, probably excluding Lake Superior. July-Oct. (Chamaesyce p.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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