General:
Annual herb from a taproot; stems simple or branched, with stiff, straight, appressed to somewhat coarse, long hairs, 5-30 cm tall.

Leaves:
Scattered along the stem, linear to oblong, 1-4 cm long, short-bristly, alternate, entire.

Flowers:
Inflorescence of several coiled, often paired,1-sided, spikelike arms; petals white, fused into a short tube that spreads (1-2 mm wide) at the top to 5 lobes, with yellow bulges at the throat; calyces 2.5-4 mm long in fruit, with long, coarse hairs or bristles.

Fruits:
Nutlets 4, clustered together, to 2 mm long, egg-shaped, smooth or finely sandy on surface (granular), compressed, groove on inner face off to one edge, more or less closed at the base.

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