Herbaceous perennial from a short rhizome. Stems prostrate to erect, 4–30 cm, simple or branched below. Herbage glabrous to sparsely villous. Leaves petiolate; blades lanceolate to ovate, entire to shallowly crenate, 2–7 cm long. Inflorescence of verticillasters in a dense, terminal spike 2–5 cm long; bracts purplish. Flowers: calyx 10-veined, sparsely villous, bilabiate, 6–10 mm long, upper lip with 3 shallow lobes, lower lip with 2 apiculate lobes; corolla bilabiate, purple, 10–15 mm long, upper lobe hood-like, middle lower lobe large and ciliate; stamens 4, enclosed in the hood; style equally 2-lobed (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Our plants are varieties vulgaris
(W.P.C. Barton) Fernald.
Disturbed and moist areas, including lawns.