Theligonum cynocrambe is a low to short prostrate or occasionally erect, usually hairless annual herb, leaves entire, ovate, untoothed.

somewhat succulent, the lower are opposite and the upper alternate by the suppression of one leaf of each pair, there are peculiar united membranous stipules.

Large club-shaped glands are present at the apex of the leaves, flowers insignificant with membranous perianth, 2–3 mm, green, unisexual with both sexes on the same plant, in one to three-flowered clusters.

There are 7 up to 12 but sometimes as few as 2 and as many as 30 stamens with filiform filaments and anthers that are erect in the bud, but pendulous later, the female flowers have a tubular shortly toothed perianth and ovary of a single carpel containing a single basal ovule.

Grows in rocky habitats, sandy ground, old walls, often in damp and shaded places.