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

General:
Perennial herb from a long creeping rhizome; stems erect, 10-80 cm tall, sometimes branched above, smooth, glaucous; milky juice appearing when stems or leaves broken.

Leaves:
Alternate or the lowermost nearly opposite, numerous, unstalked, linear to narrowly lanceolate, smooth-margined, 2-10 cm long, smooth.

Flowers:
Inflorescence a long, terminal, smooth to minutely glandular-hairy, spike-like cluster of numerous short-stalked flowers, at first dense, elongating in age; corollas bright yellow with a central, orange-hairy patch at the throat, 20-35 mm long including the long straight basal spur, which is about as long as the rest of the corolla, 2-lipped, the upper lip 2-lobed, the lower lip 3-lobed; calyces 2-4 mm long, deeply 5-lobed, the lobes nearly distinct, lanceolate; stamens 4.

Fruits:
Capsules, egg-shaped to broadly cylindric, 5-10 mm long; seeds numerous, disc-shaped with broad wings, about 2 mm long, the central portion pimply.