Euphorbia glyptosperma Engelm.  
Family: Euphorbiaceae
rib-seed sand-mat, ridge-seeded spurge
[Chamaesyce glyptosperma (Engelm.) Small]
Euphorbia glyptosperma image
Gary Fewless  
Etymology: Chamaesyce: ancient Greek Chamai meaning "on the ground" for a kind of prostrate plant
Plants: sprawling to matting, annual, 4"-12" tall forb, leaves and stems hairless; many mat-forming, compound branches, milky juice
Leaves: oblong, mostly the same width at both ends, often asymmetric, some minute teeth at the tip
Flowers: white, 4-parted, no petals or sepals but surrounded by petal-like parts; blooms June-Oct.
Fruits: 3-angled capsule with the ridged seeds sharply 4-angled seed drawing
Habitat: dry; in sandy soil
Conservation Status: Native
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