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Deciduous, semi-erect shrub or twining, trailing or climbing woody vine, sometimes to 5 m high, widely branching; twigs hollow, glabrous, green or purplish, glaucous when young; bark light coloured and shreddy.
Opposite, nearly stalked, egg-shaped or oval, 5-8 cm long, entire, rounded or blunt at tip, dark green and glabrous above, pale and often short-hairy beneath, especially on veins; margins not fringed; upper leaf pairs joined at the base, forming a disk around the stem.
Inflorescence a head-like cluster at branch tips, on very short stalks in what looks like a whorl above the disk leaves; corollas yellow to orange (often purplish or reddish with age), tubular to funnel-shaped, 2-3 cm long, the tubes often short-hairy on the outside, slightly bulging on one side at the base, 1.2-2 times as long as the 2 spreading lips; upper lips 4-lobed.
Berries, 8-12 mm thick, red, clustered in disk leaves.
Source: The Illustrated Flora of British Columbia