Physaria didymocarpa ssp. didymocarpa

General:
Tufted perennial from a heavy-rooted, often branched stem-base; stems numerous, decumbent, 2-17 cm long, with silvery starlike hairs, these not closely appressed.

Leaves:
Basal leaves numerous, in a rosette, withering and persistent, 2-8 cm long, blades egg-shaped, mostly obtuse, with few inconspicuous teeth or toothed, rarely entire, with narrow to wide winged stalks, these about as long as the blades, silvery; stem leaves several, reduced, oblanceolate, entire or with occasional tooth.

Flowers:
Racemes congested, elongating in fruit; flower stalks spreading, straight or slightly curved, 8-12 mm long; petals yellow, 9-12 mm long, broadly spoon-shaped or egg-shaped.

Fruits:
Silicles, paired, much-inflated, 1-2 cm long, at least as wide, base very slightly heart-shaped, apical sinus narrow, nearly closed, 2-4 mm deep, loosely hairy with rays of hairs spreading; beaks 6-9 mm long; seeds 2-3 per chamber.

Source:  The Illustrated Flora of British Columbia