1	"Leaflet 5--12 cm; plant erect; tendrils 0"	"Vicia faba"
1	"Leaflet generally 1--4 cm; plant sprawling or climbing; tendrils generally present"	2
2	"Inflorescence a cluster of 1--4 flowers, peduncle +- 0, < pedicels"	3
2	"Inflorescence a raceme, peduncled"	7
3	"Corolla 5--6 mm"	"Vicia lathyroides"
3	"Corolla 10--30 mm"	4
4	"Corolla pink-purple to +- white; banner glabrous; fruit hairy initially, glabrous at maturity"	5
4	"Corolla yellow or yellow-white, often purple-blotched or -tinged; banner puberulent abaxially or glabrous; fruit hairy"	6
5	"Calyx tube 4.5--5.5 mm, lobes 3--4.5 mm; corolla 10--18 mm, pink-purple to +- white"	"Vicia sativa subsp. nigra"
5	"Calyx tube 6--7 mm, lobes 5--11 mm; corolla 18--30 mm, generally pink-purple"	"Vicia sativa subsp. sativa"
6	"Banner glabrous; fruit hairs from conspicuous tubercles"	"Vicia lutea"
6	"Banner puberulent abaxially; fruit hairs not from conspicuous tubercles"	"Vicia pannonica"
7	"Corolla 3--9 mm"	8
7	"Corolla > 9 mm"	12
8	"Fruit 6--10 mm, with spreading hairs, stalk-like base 0; leaflets 10--16, flowers generally 2--8"	"Vicia hirsuta"
8	"Fruit 10--30 mm, glabrous or +- strigose, stalk-like base +- 1--2 mm; leaflets, flowers various, included as at 8."	9
9	"Fruit 10--13 mm, tip rounded, style reflexed; leaflets 4--10, linear to elliptic, peduncle thread-like, 1--3 cm, often curved, 1--3-flowered"	"Vicia tetrasperma"
9	"Fruit 10--30 mm, tip tapered to style, straight to curved; leaflets or peduncle not as at 9."	10
10	"Leaflets +- 12--20; flowers 2--6; seeds 2"	"Vicia disperma"
10	"Leaflets 4--10; flowers 1--3; seeds generally > 2"	11
11	"Style hairs at tip, generally abaxial; leaflet tip generally truncate, notched, or 1--5-toothed; flowers separated or 1"	"Vicia hassei"
11	"Style hairs at tip, below, all around; leaflet tip acute, 1-toothed, or occasionally truncate; flowers generally crowded or 1"	"Vicia ludoviciana subsp. ludoviciana"
12	"Leaf generally 1--1.5 dm; leaflets 16--24, larger 2.5--4 cm --- fruit often upcurved, +- 12--13 mm wide"	"Vicia gigantea"
12	"Leaf rarely > 1 dm; leaflets either fewer or smaller than at 12."	13
13	"Flowers 1--3, crowded at tip of inflorescence axis; fruit hairy, margins ciliate; stipules unlobed, dentate"	"Vicia bithynica"
13	"Flowers 3--25, +- evenly spaced along inflorescence axis; fruit glabrous to strigose, margins not ciliate; stipule lobes entire or lower lobe dentate"	14
14	"Flowers generally spaced, on > 1 side of axis (except occasionally when pressed), 15--25 mm, length when pressed 2.5--3.5 &times; width; stalk-like fruit base 2--5 mm"	"Vicia americana subsp. americana"
14	"Flowers not spaced, generally on 1 side of axis, generally < 18 mm, length when pressed generally 4--6 &times; width; stalk-like fruit base 1.5--3 mm"	15
15	"Inflorescence generally +- = subtending leaf, 3--12-flowered; corolla dark or red-purple; fruit densely strigose"	"Vicia benghalensis"
15	"Inflorescence generally > subtending leaf, generally 10--25-flowered; corolla blue-purple or lavender to +- white; fruit glabrous or with short, sparse appressed hairs"	16
16	"Calyx generally obliquely attached but only +- lopsided-swollen at base; flower length when pressed +- 3--3.5 &times; width; fruit 6--7 mm wide"	"Vicia cracca"
16	"Calyx both obliquely attached and lopsided-swollen at base; flower length when pressed 4--6 &times; width; fruit 6--10 mm wide"	17
17	"Hairs on stems, leaves 0 or sparse, appressed, +- 1 mm; lower calyx lobe narrowly lanceolate, generally 1--2.5 mm"	"Vicia villosa subsp. varia"
17	"Hairs on upper stems, leaves not sparse, spreading, 1--2 mm; lower calyx lobe linear, 2--4 mm"	"Vicia villosa subsp. villosa"