General:
Annual herb from a taproot; stems prostrate, hairy, mat-forming, the mats up to 100 cm wide, freely branching.

Leaves:
Stem leaves opposite, pinnately lobed with 4-8 pairs of leaflets, the leaflets egg-shaped, 5-15 mm long; stipules 1-2 mm long.

Flowers:
Inflorescence of short-stalked, single, axillary flowers; petals 5, yellow, 3-5 mm long; sepals 5.

Fruits:
Schizocarps, of 5 nutlike segments, the segments horny, 2-spined, the spines 2-6 mm long; fruit segments 2-4 seeded. vol5_7 PTERIDOPHYTES10

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