General:
Stout perennial herb from an elongated, thickened taproot or necklace-like or tuberous base, capped by a simple, often subterranean root-crown; stem branched near the base, 12-50 cm tall, spreading or ascending.

Leaves:
All basal, clustered near the ground, finely dissected, greyish, hairy to woolly-hairy; ultimate segments not resembling leaflets, small, narrow, pinnately dissected.

Flowers:
Inflorescence of compound umbels; flowers white or purplish-white, rarely yellow; spokes of the umbel elongating unequally, 2-6 cm long; involucel bractlets narrow, mostly linear or irregularly fused, well-developed and conspicuous.

Fruits:
Oblong to elliptic, 7-28 mm long, glabrous; wings of the fruit narrow to fairly broad.

Source:  The Illustrated Flora of British Columbia

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

Flower Colour:
White

Blooming Period:
Early Spring

Fruit/Seed characteristics:
Colour: Brown
Present over the Spring

Source:  The USDA

Synonyms and Alternate Names:
Cogswellia macrocarpa (Nutt. ex Torr. & A. Gray) M.E. Jones
Ferula macrocarpa Hook. & Arn.
Lomatium macrocarpum var. artemisiarum Piper
Lomatium macrocarpum var. ellipticum (Torr. & A. Gray) Jeps.
Peucedanum macrocarpum Nutt. ex Torr. & A. Gray