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General:
Annual herb from a taproot; stems erect, 15-70 cm tall, branched when well developed, 4-angled, bristly-hairy, also with well-distributed red- or yellow-tipped glandular-hairs.
Leaves:
Opposite, egg-shaped to lanceolate, 3-10 cm long, 1-5 cm wide, blunt-toothed, tips pointed, bases rounded or wedge-shaped, stiff-hairy; stalked.
Flowers:
Inflorescence of several dense axillary flower clusters, subtended by upper leaves; corollas tubular, purple, pink, white or pale yellow with dark markings, 13-14 mm long, the upper lip arched and entire, the lower 3-lobed, spreading, the middle lobe convex, deeply notched, bearing 2 nipple-like protuberences on the upper side near base, its network of dark markings reaching the margins or the whole lip dark; calyces about 1 cm long at flowering, somewhat larger in fruit, the erect spine-tipped teeth about equaling tube, the tube strongly 5-ribbed, hairy within; stamens 4, anthers hairy.
Fruits:
Nutlets, 4 clustered together, egg-shaped, 3-4 mm long, smooth.
Notes:
Probably originated by hybridization and polyploidy, similar to Galeopsis tetrahit.
Source: The Illustrated Flora of British Columbia
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