Thermopsis

Thermopsis is a genus of flowering plants in the legume family, Fabaceae. The genus is native to temperate regions of the Northern Hemisphere, with a wide distribution across North America and Asia. Plants in the genus are commonly known as golden banners or false lupines, due to their resemblance to lupines.

Thermopsis species are herbaceous perennials, typically growing from rhizomes. They generally have trifoliate leaves, arranged alternately on the stem. The flowers are usually yellow or yellowish-white, and are borne in erect, terminal racemes. The flowers are papilionaceous, characteristic of the pea family, with a prominent standard petal. The fruits are pods, which dehisce to release seeds.

Several species are recognized within the genus, though taxonomic classifications can vary. Some common examples include Thermopsis montana, Thermopsis rhombifolia, and Thermopsis chinensis. These plants often inhabit open woodlands, meadows, and rocky slopes.

Thermopsis has some horticultural interest, with certain species being cultivated for their attractive spring and early summer blooms. They are generally hardy plants that prefer well-drained soil and a sunny to partly shaded location. Some species have also been traditionally used in folk medicine, although scientific validation of these uses is often limited. The genus name Thermopsis is derived from the Greek words "thermos" (lupine) and "opsis" (appearance), referring to the plants' resemblance to lupines.