General:
Biennial or more usually perennial herb from short, slender taproot; forming mats or clumps up to 80 cm across; stems usually numerous, decumbent, freely branched, densely white woolly-hairy, 10-35 cm long.

Leaves:
Stem leaves opposite, oblanceolate, grey-hairy to white woolly-hairy, 3-20 mm long and 2-4 mm wide, 1-nerved, unstalked; stipules lacking.

Flowers:
Inflorescence in an elongated cluster; petals 5, white, longer than the sepals, 5-7 mm long; sepals 5, 2-4 mm long, hairy.

Fruits:
Capsules cylindric, 7-10 mm long, 10-valved; seeds 0.6-0.8 mm long.

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