Thermopsis gracilis is a species of flowering plant in the legume family known by the common name slender goldenbanner.

[1][2] 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.

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.