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Perennial herb from a rootstock; stems erect, solitary, simple, smooth, reddish- to purplish-black streaked, 20-90 cm tall.
Basal leaves lacking; stem leaves opposite, the lowermost leaves unstalked, clasping-based, 5-15 cm long, the upper leaves linear-lanceolate to narrowly elliptic or lanceolate, 3-8 cm long, short-stalked, dotted with black spots, with small, dark bulblets produced in the leaf axils.
Inflorescence a terminal, loose, leafy-bracted, simple to compound, elongate cluster, the individual flowers on stalks arranged on a single axis, the lower flowers often whorled, the flower stalks slender, 1-2 cm long; corollas deep yellow, saucer-shaped, streaked with red or purplish-black spots, deeply 5-lobed, the lobes oblong to lanceolate, 4-8 mm long; calyces 5-lobed, the lobes lanceolate, 2-4 mm long; filaments about 3 mm long, fused at the bases, shorter than the corolla lobes; sterile stamens lacking.
Capsules, breaking into valves at dispersal; seeds few, chocolate brown, very finely pitted.
Source: The Illustrated Flora of British Columbia