Anemone oregana var. oregana
Aerial shoots 8-30 (-35) cm. Basal leaves: lateral leaflets 1×-lobed; ultimate lobes 0.4-2 mm wide. Inflorescences: involucral-bracts with terminal leaflet 2-8 × 1-3 (-3.5) cm, base cuneate, margins crenate to deeply serrate, apex acuminate to acute; lateral leaflets unlobed or 1×-lobed; ultimate lobes 0.5-2 mm wide. Flowers: sepals blue to purple, reddish, or purple to pink, rarely nearly white; stamens 30-60, occasionally more. Achenes: body puberulous to pilose, rarely glabrous. 2n=16.
Phenology: Flowering spring (Mar–Jun).
Habitat: Shaded, moist woods, open hillsides
Elevation: 100-1800 m
Calif., Oreg., Wash.
"broadened" is not a number.