A low, shrublike perennial with twisting stems that are erect, reclining, or vining, with soft, short hairs. Flowers solitary or few on very short peduncles, to 2 inches long, beautiful pale blue and lilac with darker veining, arising from leaf axils. The overall floral structure is that of typical pea flowers, though the standard (the large upper petal) is comparatively much larger than usual. One scientist has suggested that late in the season the plant produces small, budlike, insignificant flowers, which also produce seed. Blooms May–September. Leaves alternate, compound, with 3 leaflets, the center leaflet on a longer stem than the two lateral ones. Fruit a bean pod about 2 inches long.