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General:
Stems erect, solitary, from creeping rhizomes, simple or sometimes branched, not dark-spotted, glabrous, 20-130 cm tall.
Leaves:
Leaves opposite, long-stalked, ovate to broadly-lanceolate, apices acute to acuminate, bases rounded to cordate, entire, surfaces glabrous, margins ciliate (cilia to 2 mm), 4-17 (20) mm; petiole 0.5-6 cm.
Flowers:
. Inflorescences of solitary, axillary flowers in axils of upper leaves Flowers long-stalked; corollas rotate, 5-lobed, 5-12 mm wide; corolla lobes yellow, sometimes with a reddish base, not streaked or spotted, apices mucronate, margins sometimes slightly erose; calyces green, not streaked, 2.5-9 mm, sometimes stipitate-glandular; calyx lobes lanceolate filaments partly connate, shorter than the corollas; pedicels slender, arched, usually stipitate-glandular, (0.5) 1.5-7 cm. Flowering (Jun) Jul-Sep.
Fruits:
Capsules glabrous, 5-7 mm.
Source: The Illustrated Flora of British Columbia
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