Annual. Stems prostrate, to 15 cm. Leaves glabrous, 3–10 mm long, fascicled; stipules 3–5 mm long. Flowers solitary, long-stalked from upper leaf axils or few-flowered terminal cymes; sepals 3–4 mm long. Capsule ca. as long as calyx; seeds with a sub-marginal groove (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Disturbed soil of grasslands, open forest, margins of streams and wetlands, often along trails and roads; montane (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).