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Perennial herb; stems erect or ascending, solitary, simple or branched below, slightly if at all dotted with reddish or blackish spots, densely glandular-hairy, 60-150 cm tall.
Basal leaves lacking; stem leaves opposite or in whorls of 3 or 4, lanceolate to narrowly elliptic, dotted with reddish or blackish spots, 3-10 cm long.
Inflorescence branching, with younger flowers borne at the tips, leafy-bracted; corollas uniformly yellow, without streaks or dots, 8-11 (13) mm wide, 5-lobed, the lobes entire; calyces 5-lobed, the lobes at most about 5 mm long, dark-margined; styles deciduous; filaments fused at the bases; sterile stamens lacking.
Capsules, breaking into valves at dispersal; seeds few.
Source: The Illustrated Flora of British Columbia