Sub-category: Pea family
It is native to Europe but is present on other continents, such as North America, where it is an introduced species. It has winged hairless stems, and alternating blue green compound leaves consisting of a single pair of leaflets and a winged petiole about 2 inches long. The leaflets are narrowly ovate or oblong-ovate, smooth along the margins, hairless and up to 3 inches long and 1 inch across. There are branched tendrils between the leaflets. Short racemes of 4 to 11 flowers are produced from the axils of the leaves. The flowers, which are unscented, are about 3/4 to 1 inches across with an upper standard and lower keel, enclosed by lateral petals. There are 5 petals, which are purplish pink, fading with age. There is a green calyx with 5 teeth, often unequal. The blooming period lasts about 2 months during the summer and early autumn. The flowers are replaced by hairless flattened seedpods, about 2 inches long and 1/2 inch wide, with several seeds inside. The seedpod, which is initially green, gradually turns brown, splitting open into curled segments, flinging out the seeds. The seeds are dark and oblong to reniform in shape.
While generally grown as a garden plant it may wander.