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Common chickweed's flower stems arise from the axils of outer pairs of leaves; the flower stems terminate in small cymes of flowers. Individual flowers are about 1/4" across, consisting of five green sepals longer than the petals, tapering to a point, hairy on the outside; five white, widely-spaced, bifid (deeply notched, each appearing double) petals; 2-10 (usually 3-5) stamens with reddish-violet anthers; and a central green ovary with three styles fused except at their flaring tips. The fruits are light brown, cylindrical, 4-6 mm long seed capsules nestled in the embrace of the (hairy) sepals with six small teeth around their upper ends. Common chickweed is usually self-pollinating (autogamous) but is occasionally cross-pollinated by flies. Chickweeds of the genus Stellaria (like common chickweed) have three styles; chickweeds of the genus Cerastium (like mouse-eared chickweed) have five styles. The flowers of whitlow-grass (Draba verna) are superficially similar to common chickweed in size and color but have only four bifid petals rather than five. One odd (but distinguishing) characteristic of common chickweed — if you bend the stem back and forth, the epidermis and parenchyma will split, leaving a central vascular bundle which will stretch elastically if you then pull the broken segments apart.

Stellaria

Stellaria media

common chickweed [Blooms: Apr-May]