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Annual herb from a taproot; stems slender, erect, 10-40 cm tall, simple or freely branched, minutely hairy.
Opposite, unstalked, few, egg-shaped to nearly circular, 5-15 mm long, palmately veined, prominently 7- to 11-toothed, smooth or sparsely hairy beneath; bracts resembling the leaves but with awl-shaped or bristle-tipped teeth.
Inflorescence a terminal spike of single flowers in the axils of leafy bracts; corollas typically pale lavender with purple lines, and a yellow spot on the lower lip, 5-10 mm long, 2-lipped, the upper lip slightly concave with 2 lobes, the lower lip spreading, with 3 notched, oblong lobes; calyces bell-shaped, smooth or nearly so, shorter than the corolla, 4-toothed, the teeth lanceolate, 2-3.5 mm long; stamens 4.
Capsules, oblong, flattened, smooth or nearly so; seeds numerous, 1-2 mm long, narrowly winged.
Source: The Illustrated Flora of British Columbia