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General:
Perennial herb from creeping rhizome; stems erect, 30-70 cm tall, branched above, often with short axillary sterile branches below, somewhat hairy, 4-angled; culinary herb.
Leaves:
All stem leaves; opposite, egg-shaped, 1-3 cm long, entire or nearly so, scattered hairy, minutely gland-dotted; stalks 3-5 mm long; gradually reduced toward the inflorescence.
Flowers:
Inflorescence of several, axillary and terminal, panicle-like flower clusters; bracts elliptic or diamond- to egg-shaped, 3-5 mm long, often purple-tipped; corollas tubular, white to red-purple, 4-7 mm long, 2-lipped, the upper lip nearly entire, the lower lip 3-lobed; calyces 1-2.5 mm long, gland-dotted, sparsely hairy, short-bristly within, 13-veined; calyx teeth 5, lance-triangular or nearly egg-shaped, nearly equal in length, shorter than tube, generally purplish.
Fruits:
Nutlets, 4 clustered together, egg-shaped, smooth.
Source: The Illustrated Flora of British Columbia
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