Reproducing only by seed.
Thin, yellowish-green stems.
Flat leaves in whorls of 3 to 8 at each node.
Carpetweed flowers from June to August. Clusters of small, pale green to whitish flowers on short (5-15mm) stalks that come from the axils of the whorled leaves. Flowers usually have 3 stamens. Seedpods are small (3mm long) and ovoid and split lengthwise to reveal the tiny seeds.
It is distinguished from prostrate spurges (like Hairy-fruited spurge), by its whorls of leaves and complete absence of white, milky juice.
Carpetweed plant with root. Note whorled leaves and white flowers.
Carpetweed growing in field. Photo taken in Southwestern Ontario, late June.