Glabrous annual. Leaves basal (alternate); petioles 1–25 cm long; blades narrowly oblong, entire, 4–25 mm long. Scapes 5–20 mm long. Flowers: calyx 1–3 mm long, campanulate with 5 deltoid lobes shorter than the tube; corolla campanulate, white, 2–3 mm long, ca. regular, 5-lobed; stamens 4; stigma capitate. Capsule ovoid, 2–3 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).