Big-leaf Lupine, Large-leaved Lupine
Lupinus polyphyllus var. prunophilus
Synonyms: Lupius arcticus var. prunophilus, Lupinus garfieldensis, Lupinus prunophilus, Lupius wyethii var. prunophilus
In Oregon, this taxa includes Wyeth's lupine (Lupinus wyethii)

Large-leaved lupine as seen in Sourdough Gulch, Asotin Wildlife Area, Asotin County, WA..........June 3, 2017.
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Large-leaved lupine as seen in Sourdough Gulch, Asotin Wildlife Area, Asotin County, WA..........June 3, 2017.
Paul Slichter