Stems prostrate, rooting at the nodes. Leaves sessile below, short-petiolate above; the blades orbicular to elliptic, 1–3 cm long, glandular-punctate. Flowers solitary at leaf nodes; pedicels 1–5 cm long; calyx 6–9 mm long; corolla rotate, 2–3 cm across, the lobes obovate, glandular-ciliolate. Capsule 4–8 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).