Probably Eastern or hybrid.
Shrub with green branches; leaves divided into 3 leaflets; calyx 2-lipped. Gently curved entire leaves. Flowers yellow.
Rob's mini-bioblitz of References Stand No. 2 (RS2), HJ Andrews Experimental Forest, Willamette National Forest, Oregon, USA. West Cascades ecoregion. 1706 feet. May 20, 2022.
https://andrewsforest.oregonstate.edu/research/infrastructure/permanent-vegetation-plots
Plot size: 1 ha -- Established: 1971 (expanded 1978) -- Remeasurements: 1976, 1978, 1983, 1988, 1993
Aspect: WNW -- Slope: 35% -- Landform: fan terrace -- Soil Parent Material: mixed alluvium-colluvium
Plant association: Tsuga heterophylla/Rhododendron macrophyllum-Berberis nervosa.
Age class: Old-growth -- Soils -- see profile no. 78 in the HJA Soil Data Base.
General Stand Description -- RS2 is on a pediment surface between backslope and footslope. RS 2 is representative of the TSHE/RHMA-BENE habitat type of Dyrness et al. (1974) with a well-developed canopy, little shrub layer development, and moderate herb cover.
Project page for this bioblitz: https://www.inaturalist.org/projects/rob-mini-bioblitz-reference-stand-2-hja
Probably Eastern or hybrid.