June 15, 2015
Chamaesyce humistrata (Engelm. ex Gray) Small Euphorbiaceae (Spurge family)
Prostrate summer annual.
Cotyledons are oval with maroon undersides and short petioles. Opposite, pale green, egg-shaped leaves with rounded tips have small, irregular teeth along the margins and short petioles. The upper leaf surface often has a maroon watermark.
Prostrate, densely hairy stems are highly branched from the base, forming circular mats up to 16 inches in diameter. Stems may root at the lower nodes, and may exude a milky sap when damaged.
Flowers and fruit
Inconspicuous flowers are formed in the leaf axils. Fruit are hairy, three-lobed capsules that contain three-wrinkled, three-sided, pale brown seeds.
Spotted spurge (Chamaesyce maculata [L.] Small)
Differs by having stems that do not root at the nodes, narrow oval to oblong leaves, and ridged, not wrinkled, seeds.
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