Thermopsis montana

Thermopsis montana, the false lupin, mountain goldenbanner, golden pea, mountain thermopsis, or revonpapu, is a plant species which is native of the western United States.
The Latin specific epithet "montana" refers to mountains or coming from mountains.
Cultivation.
It is used as a medicinal plant, and as an ornamental plant in gardens. However, it is suspect of being poisonous. It is avoided by livestock.