Clematis orientalis L.
Annotated by Peter Dunwiddie, 2019. Sources: Flora PNW, 2nd.

Oregon: Gilliam County: I-84 roadside ca. 2 miles east of LePage Park.
45.740086° N, 120.614965° W
Datum: WGS 84. Coordinate Source: GPS.
One plant in crevice on basalt cliff with Aquilegia formosa, Erythranthe jungermannioides, Chrysothamnus viscidiflorus. Easternmost occurrence of Clematis on I-84. Sepals 21mm long, apex hooded and mucronate, tips recurved, light yellow, margins inrolled and white tomentose; stamens 9mm, anthers 3mm, greenish white, filaments expanded at base, green and hairy; stigmas bright yellow, longer than anthers. Leaves opposite, pinnate with 5 leaflets, leaflets ternate, leaflet 3-lobed or 3-parted, margins with a 2-5 large teeth, petiolules twining. Phenology: Flowers.

Peter Dunwiddie PWD-19-393, Aug 1, 2019
With Peter ZIka
WTU