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General:
Perennial herb from a creeping rhizome; stems erect, 15-90 cm tall, simple or branched, 4-angled; strongly lemon-scented, but not pungent.
Leaves:
Opposite, usually egg-shaped, 2-6 (9) cm long, 1-4 cm wide, more or less hairy, toothed, tips pointed or rounded, bases wedge-shaped to somewhat lobed; stalked.
Flowers:
Inflorescence of a terminal head of 1 to 3 flower clusters and usually 1 to 3 axillary flower clusters below; lower bracts leaf-like, upper lanceolate or linear-lanceolate, hidden by the flowers; flower stalks hairy; corollas tubular, light purple, 4-lobed, the lobes nearly equal; calyces bell-shaped, nearly equally 5-toothed, hairy.
Fruits:
Nutlets, 4 clustered together, egg-shaped.
Source: The Illustrated Flora of British Columbia
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