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 et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
POLLINATORS 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).