Thermopsis gracilis is a species of flowering plant in the legume family known by the common name slender goldenbanner.
It is native to the western United States from Washington state to northern California.[1]
It grows in open mountain forests and other habitats.
Thermopsis gracilis is a rhizomatous perennial herb producing a fuzzy-haired, hollow stem up to a meter (3 ft.) tall. Each leaf has three leaflets as well as stipules that look like leaflets.
The inflorescence is a raceme of many bright yellow pealike flowers each measuring 2 centimeters long or more. The fruit is a leathery legume pod containing the seeds.