Melampyrum lineare var. lineare

General:
Annual herb; stems slender, ascending to erect, 10-40 cm tall, simple or commonly with a few branches, nearly smooth to minutely hairy or glandular, especially above.

Leaves:
Opposite, short-stalked, lanceolate to linear, mostly entire, the uppermost leaves often toothed near the base, 2-5 cm long, smooth or glandular.

Flowers:
Inflorescence a leafy-bracted terminal spike, or of solitary, short-stalked flowers in the upper leaf axils; corollas white to straw-coloured or pinkish, tubular with a yellow patch in the throat, 5-12 mm long, 2-lipped, the upper lip hood-like, the lower lip 3-lobed; calyces cup-shaped, deeply 4-lobed, the lobes awl-shaped; stamens 4.

Fruits:
Capsules, curved, asymmetrically egg-shaped, flattened, 8-10 mm long; seeds 1 to 4, 2-4 mm long, blackish with light-coloured tips when mature.

Source:  The Illustrated Flora of British Columbia