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General:
Annual herb from a short taproot; stems slender, weak, ascending or reclining with tips ascending, 10-40 cm long, generally branched from the base, glabrous to inconspicuously hairy, 4-angled.
Leaves:
Opposite, rounded to egg- or heart-shaped, 1-2 cm long, 1-3 cm wide, margins coarsely blunt-toothed or with small lobes, hairy on upper surface; lower leaves stalked, upper leaves unstalked and clasping.
Flowers:
Inflorescence of several well-spaced flower clusters in axils of leaf-like bracts, the bracts unstalked, usually wider than long; corollas tubular, purplish, 12-18 mm long, glabrous inside, hairy outside, strongly 2-lipped, the upper corolla lip erect, oval, hood-like, hairy, 3-5 mm long, the middle lobe of lower corolla lip spotted, the lateral lobes very small, represented by a short tooth; calyces 5-8 mm long, 5-veined, the teeth narrow and erect with pointed tips, about the length of the tube, hairy; occasional plants produce small, unopened flowers.
Fruits:
Nutlets, 4 clustered together, three-angled, squared-off at tips.
Source: The Illustrated Flora of British Columbia
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