12a. Style with a tuft of hairs at the apex; lateral petals of the corolla adherent to the lower ones as far as the middle; stipules less than 10 mm. long, and usually less than one-fourth the length of the lower leaflets (spring and summer) (Vetch) --13. 12b. Style hairy along the inner side; lateral petals of the corolla free from the lower ones or adherent only at the very base; stipules more than 8 mm. long and usually one-third or more the length of the lower leaflets (late spring and summer) --17. 13a. Flowers axillary, sessile or nearly so (flowers purple) --14. 13b. Flowers in peduncled racemes --15. 14a. Upper leaves oblong-obovate, truncate or notched, and mucronate at the apex =Spring Vetch, Vicia sativa.= 14b. Upper leaves lance-linear, sharply acute =Common Vetch, Vicia angustifolia.= 15a. Flowers 15-20 mm. long, 4-8 in a cluster (flowers purple) =Vetch, Vicia americana.= 15b. Flowers 8-12 mm. long --16. 16a. Racemes one-sided; flowers blue =Vetch, Vicia cracca.= 16b. Racemes loosely flowered, not one-sided; flowers whitish, the lower petals tipped with blue =Vetch, Vicia caroliniana.= 17a. Flowers yellowish-white =Vetchling, Lathyrus ochroleucus.= 17b. Flowers purple --18. 18a. Stipules nearly regularly halberd-shape, almost as large as the leaflets =Beach Pea, Lathyrus maritimus.= 18b. Stipules half-sagittate, apparently attached laterally near the middle --19. 19a. Leaflets 4-8 pairs, ovate; racemes with 10 or more flowers =Wild Pea, Lathyrus venosus.= 19b. Leaflets 2-4 pairs, linear to oblong or elliptical; racemes with 2-9 flowers (Marsh Pea) --20. 20a. Stems with a membranous wing on the margins =Marsh Pea, Lathyrus palustris.= 20b. Stems angled, but not winged =Marsh Pea, Lathyrus palustris var. myrtifolius.= 21a. Leaves simple (2-3 dm. high; flowers yellow, summer) =Rattlebox, Crotalaria sagittalis.= 21b. Leaves palmately compound; leaflets 7-11 (3-6 dm. high; flowers blue, late spring) =Lupine, Lupinus perennis.= 21c. Leaves pinnately compound; leaflets 5 to many --22. 21d. Leaves compound; leaflets 3 --28. 22a. Leaflets 5; flowers rose-purple in a spike-like head (5-8 dm. high, late summer) =Prairie Clover, Petalostemum purpureum.= 22b. Leaflets more than 5 --23. 23a. Flowers bright-blue, in a dense spike (3-6 dm. high; summer) --8a. 23b. Flowers bright-yellow; stamens not united (summer) --24. 23c. Flowers white, cream-color, or yellowish, or marked with purple --26.