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General:
Lemon-scented, perennial herb from a woody rhizome or elongate stem-base and fibrous roots; stems erect, 30-100 cm tall, branched, somewhat hairy and glandular-hairy, 4-angled; cultivated for sweet scent.
Leaves:
Opposite, lower soon deciduous, middle stem leaves egg-shaped, 4-9 cm long, 2.5-5 cm wide, coarsely blunt-toothed, becoming glabrous, stalks more than half as long as blades; uppermost leaves gradually reduced, tapering to shorter stalks.
Flowers:
Inflorescence of several-flowered clusters in leaf axils at upper nodes; flower stalks 2-5 mm long; corollas tubular, white to pinkish, 8-15 mm long, 2-lipped, the upper lip hood-like, notched, the lower lip 3-lobed; calyces 7-9 mm long, 2-lipped, the upper lip shortly 3-toothed, the lower more deeply 2-toothed, the teeth firm, with spine tips, the tube ribbed, long soft-hairy.
Fruits:
Nutlets, 4 clustered together, egg-shaped, smooth.
Source: The Illustrated Flora of British Columbia
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