Annual herb from a taproot; stems erect, glabrous, 0.3-1 (1.5) m tall.
Stem leaves compound, dissected into linear segments, 4-8 cm long; without well-defined leaflets; aromatic.
Inflorescence terminal, flat-topped, of umbrella-like clusters; flowers yellow.
Numerous, 4 mm long, elliptic, strongly flattened crosswise with winged lateral ribs.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia