E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Annual herb from a taproot; stems erect, sometimes decumbent, simple or branched, minutely hairy or glandular-hairy at least above, 5-30 cm tall.

Leaves:
Upper leaves alternate, entire, linear to lance-elliptic; lower leaves opposite, more egg-shaped; 1-5 cm long, unstalked, at least the upper leaves hairy to glandular.

Flowers:
Inflorescence of pairs of flowers (one stalked the other not) at the ends of the stem and branches, or single in the axils of leaf-like bracts; corollas pinkish-white, 5-15 mm long, the tube white or yellowish, spreading to five pink to pale purple, squared-off or notched, 1-2 mm long lobes; calyces 5-10 mm long, glandular-hairy, with 5 green ribs separated by membranous tissue that is ruptured by the ripening capsule, the slender teeth about as long as the tube.

Fruits:
Capsules, spheric to egg-shaped, 3-chambered; seeds 1 per chamber.