Key to Wisconsin Vicia

• 1a.Inflorescence sessile or on a peduncle shorter than the leaflets, 1–2 flowered V. sativa

• 1b.Inflorescences on peduncles longer than the leaflets, usually with more than 2 flowers 2

• 2a.Corolla 2–6 mm long; legumes 1–4 seeded; annuals 3

• 2b.Corolla 8 mm or more long; legumes 4–8 seeded; perennials 4

• 3a.Calyx teeth equal or nearly so; fruit pubescent, 6–10 mm long, 2-seeded V. hirsuta

• 3b.Calyx teeth unequal; fruit glabrous, 10–13 mm long, 4-seeded V. tetrasperma

• 4a.Stipules with many teeth or lobes; leaflets with 10 or more pairs of lateral veins; inflorescences slightly exceeded by the subtending leaves, 3–8 flowered V. americana

• 4b.Stipules unlobed or with 1 basal lobe; leaflets with 6 or fewer pairs of lateral veins; inflorescences exceeding the subtending leaves; 7–50 flowered 5

• 5a.Flowers overlapping in dense racemes; calyx teeth unequal, at least the lowest lance-attenuate to subulate; corolla blue to purple or blue and white V. caroliniana

• 5b.Stems upright, never rooting at the nodes; calyx not inflated 6

• 6a.Calyx gibbous at the base, projecting beyond the point of attachment of the pedicel, thus appearing ventral; blade of standard less than half as long as the claw; stem pubescence spreading villous V. villosa

• 6b.Calyx not gibbous at the base, the pedicel appearing basal; blade of standard about equaling the claw; stem pubescence appressed V. cracca