Is a nitrogen fixing leguminous plant. Although considered a weed when found growing in a cultivated grainfield, this hardy plant is often grown as green manure or livestock fodder. Annual herb with hollow, four-sided, hairless to hairy stems which can reach two meters in maximum length. The leaves are each made up of a few pairs of linear, lance-shaped, oblong, or wedge-shaped, needle-tipped leaflets up to 3.5 centimeters long. The pealike flowers occur in the leaf axils, solitary or in clusters of up to three. The flower corolla is 1 to 3 centimeters in length and whitish to bluish to red or bright pink-purple in color. The fruit is a legume pod up to 6 or 7 centimeters long which is hairy when new and smooth later. It contains up to 12 seeds.
In the sides of paths and cultivated fields.