Chamaesyce serpyllifolia
(Thymeleaf Spurge)
Family: Euphorbiaceae (Spurge)
Thymeleaf Spurge forms a ground cover on dry, disturbed sites. It also grows in pavement cracks. Leaves have small teeth near the tip. Small flowers grow at leaf axils and have white bracts that look like petals. Plants have a milky sap. Seeds are smooth.

Vegetation zone:  Plains, Foothills, Montane
Time of bloom:  May - October
Origin:  Introduced
Eastern Colorado Wildflowers