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Annual herb from a taproot; stems erect, solitary, simple, smooth, 10-60 cm tall.
Basal leaves soon deciduous; stem leaves opposite, lowermost leaves spoon-shaped or egg-shaped with short stalks, others more oblong or elliptic and stalkless, smooth, 1-6 cm long, 3-22 mm wide.
Inflorescence of terminal, more or less headlike clusters; corollas white to pale or dark pink 1.5-9.5 mm long, 2-lobed, with a slender spur, the tip usually enlarged; calyces lacking.
Achenes, dry, 2-4 mm long, convex side of body usually keeled, not grooved lengthwise, winged or not, the wing margins not thickened, hairy near the tips or along the margins.
Two closely related varieties occur in our region
1. Corollas 1.5-3.5 mm long, white to pale pink ..... var. major (Fisch. & C.A. Mey.) Dyal
1. Corollas 4-9.5 mm long, pale to dark pink ..... var. congesta
Source: The Illustrated Flora of British Columbia