General:
Perennial vine; stems climbing or trailing on the ground, to 3 m long, sparsely soft-hairy when young.

Leaves:
Opposite, long-stalked, pinnately compound, the 5 to 7 leaflets short-stalked, lanceolate to oblong or elliptic, 2-6 cm long, 0.5-1.5 cm wide, not lobed or lobed in lower end, margins toothed, usually hairy above.

Flowers:
Inflorescence of terminal and axillary solitary flowers (occasionally 2 or 3) on stalks 0.6-3 cm long, the flowers bisexual; petals absent; sepals 4, ascending, sometimes spreading near tip, bright yellow, lanceolate to elliptic, 1.8-3.4 cm long, length about 2.5x width, margins and outside silky-hairy, smooth inside; stamens 20 to 50, filaments hairy near base; pistils 80-150.

Fruits:
Achenes, turgid, soft-hairy; beaks 2-4.5 cm long, feathery-hairy.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Clematis orientalis var. tangutica