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Annual herb from a short taproot; stems branched from the base, reclining, inconspicuously hairy, 10-40 cm long, often somewhat purple tinted, 4-angled.
Opposite, egg-shaped to almost round, 1-5 cm long, obtuse at tip, heart-shaped at base, margins toothed with rounded to somewhat sharp teeth; leaves all stalked, the stalks 1-3 cm long.
Inflorescence of several axillary flower clusters at ends of branches; bracts leaf-like, but smaller than leaves and uppermost unstalked; corollas tubular, pink-purple, 10-15 mm long, longer than calyces, hairy outside, with or without a ring of hairs inside near the base, the hood-like upper lip 2-4 mm long; calyces tubular bell-shaped, 5-6 mm long, the slender teeth firm, unequal, somewhat spreading, about as long as the tube, hairy.
Nutlets, 4 clustered together, three-angled, squared-off at tips.
Two varieties occur in BC. The var. incisum is usually considered to be of hybrid origin between L. moschatum Mill. and L. purpureum.
1. Leaves deeply sharp-toothed ..... var. incisum (Willd.) Pers.
1. Leaves round-toothed ..... var. purpureum
Source: The Illustrated Flora of British Columbia