Large-flowered vetch

Appearance

V.grandiflora is with branching stems that are finely pubescent to glabrous. The stipules of the upper and lower leaves are differentiable: the upper are entire, ovoid, and 2-3mm long, while the lower are lanceolate, longer, and have coarsely serrated margins (3-4mm long). The leaves are alternately arranged and pinnately compound, with 6-14 e-stipellate leaflets with glands beneath.
The flowers (2.6-3.5cm long) are perfect, zygomorphic, and are borne in nearly sessile (pedicels are 2-8mm long) clusters of usually two flowers, in the upper leaf axils. The calyx tube (0.6-1cm long) is short, pubescent to glabrous, and the pilose lobes (5) are nearly half as long as the tube. The petals (5) are yellowish or white; the standard and keel petals are sometimes tinged with purple. The standard is obovate and overlaps the wings. The wing petals are narrower than the standard, about the same length as the calyx tube, and adherent to the keel petals, which are shorter than the wings. The stamens are 10 (fused as 9+1). The ovary is sessile or nearly so; the style is filiform with trichomes at the apex