Stoloniferous perennial. Stems 40–100 cm, erect, creeping at the base. Herbage puberulent. Leaves opposite or whorled, lanceolate, serrate, petiolate, 4–12 cm long. Inflorescence a terminal, densely-flowered, puberulent raceme; pedicels 1–2 mm long. Flowers: calyx 2–4 mm long; corolla blue to violet, 6–9 mm across; style 6–10 mm long. Capsule ovoid, 2–4 mm long, glabrous, shallowly notched (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans
and Bombus pensylvanicus
(Colla and Dumesh 2010).