General:
Annual herb from a taproot; stems 10-50 cm tall, simple or branched especially below, hairy, sometimes glandular, 4-angled.

Leaves:
Opposite, broadly elliptic, 1.5-5 cm long, 5-20 mm wide, length less than 4X width, tips rounded to somewhat pointed; stalks less than 5 mm long.

Flowers:
Inflorescence of short, one-sided, axillary clusters; corollas tubular, blue, the tube 2-3.5 mm long, curved gradually upward, 5-lobed, the lowest 2-3.5 mm long, the other 4 about equal and slightly more than 1/2 as long as the lowest; calyces 1.5-3 mm long, the teeth about equal, more than twice the length of tube, hairy, long-pointed.

Fruits:
Nutlets, 4, joined in lower 1/3, irregularly ridged.

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