1	Wing and keel absent		Amorpha
+	Wing and keel present		(2)
2 (1)	Hairs biramous		(3)
+	Hairs basifixed		(5)
3 (2)	Anthers apiculate		(4)
+	Anthers not apiculate		Astragalus
4 (3)	Vexillary filament free, leaflets not toothed		Indigofera
+	Vexillary filaments slightly attached to the others, leaflets toothed		Cyamopsis
5 (2)	Leaf paripinnately compound or palmately 2-foliolate		(6)
+	Leaf imparipinnately or palmately compound or unifoliolate or simple		(17)
6 (5)	Anthers dimorphic		(7)
+	Anthers uniform		(8)
7 (6)	Leaf palmately 3-foliolate, fruit regularly jointed, not maturing below the soil		Zornia
+	Leaf pinnately 2-4-foliolate, fruit not regularly jointed developing below the soil		Arachis
8 (6)	Stamens diadelphous, (5) + (5), fruit jointed		(9)
+	Stamens diadelphous 9+1, fruit not jointed		(10)
9 (8)	Fruit exserted form the calyx, stipules not append- aged at the base		Aeschynomene
+	Fruit enclosed by the calyx, stipules appendaged at the base, appendix 2-auricled, one longer than the other		Smithia
10 (8)	Rachis ending in a spine		(11)
+	Rachis not ending in a spine		(12)
11 (10)	Calyx very oblique		Caragana
+	Calyx not oblique		Astragalus
12 (10)	Calyx very oblique		Caragana
+	Calyx not oblique		(13)
13 (12)	Fruit 7 cm or less long, vexillum not appendaged		(14)
+	Fruit 7-50 cm long, vexillum appendaged		Sesbania
14 (13)	Leaflets toothed		Cicer
+	Leaflets entire		(15)
15 (14)	Fruit broadly oblong, compressed, 1-2-seeded, stipules entire		Lens
+	Fruit narrowly oblong to linear-oblong; stipules foliaceous or sagittate or semisagittate		(16)
16 (15)	Style tapering apically, glabrous or bearded at apex, all round or on lower surface only; staminal sheath oblique at the apex		Vicia
+	Style flattened or dorsiventrally compressed towards apex, glabrous or bearded along the upper surface; staminal sheath truncate at he apex		Lathyrus
17 (5)	Fruit jointed		(18)
+	Fruit not jointed		(23)
18 (17)	Leaves without stipels		(19)
+	Leaves with stipels		(21)
19 (18)	Fruit stipitate, seeds 3 or less per fruit, leaf 1-3- foliolate		Taverniera
+	Fruit sessile		(20)
20 (19)	Fruit with prickly sutures		Stracheya
+	Fruit not as above		Hedysarum
21 (18)	Fruit segments flat or nearly so		(22)
+	Fruit segments terete, subterete or tetragonal (calyx glumaceous and deeply divided)		Alysicarpus
22 (21)	Fruit not enclosed by the calyx		Desmodium
+	Fruit enclosed by the calyx (calyx lobes not enlarged in fruit)		Uraria
23 (17)	Filaments free or connate at the base only		(24)
+	Filaments mono or diadelphous		(25)
24 (23)	Fruit a moniliform lomentum		Sophora
+	Fruit linear, oblong, straight or incurved, continuous within		Thermopsis
25 (23)	Anthers dimorphic		(26)
+	Anthers monomorphic		(31)
26 (25)	Stamens diadelphous (9+1)		(27)
+	Stamens monadelphous		(28)
27 (26)	Style with thickened part (and keel) twisted through more than 360º		Phaseolus
+	Style with thickened part (and keel) not twisted through more than 360º		Glycyrrhiza
28 (26)	Leaf palmately multifoliolate		Lupinus
+	Leaf simple, unifoliolate or trifoliolate		(29)
29 (28)	Calyx split to the base adaxially, teeth minute (leaf absent or unifoliolate)		Spartium
+	Calyx not split to the base		(30)
30 (29)	Style bearded, alternate filaments not dilated at the apex		Crotalaria
+	Style glabrous, alternate filaments dilated at the apex		Ononis
31 (25)	Leaflets more than 3		(32)
+	Leaflets 1-3		(41)
32 (31)	Stamens monadelphous		(33)
+	Stamens diadelphous		(34)
33 (32)	Vexillum glabrous		Galega
+	Vexillum pilose externally		Tephrosia
34 (32)	Leaflets 5,2 lower leaflets at stipular position, stipules glandular or obsolete		Lotus
+	Leaflets more than 5		(35)
35 (34)	Fruit beaked with thickened margin		Securigera
+	Fruit not beaked		(36)
36 (35)	Fruit suborbicular, compressed, crested or prickly		Onobrychis
+	Fruit not as above		(37)
37 (36)	Style bearded inside, fruit inflated		Colutea
+	Style not bearded, fruit not inflated		Oxytropis
38	Keel mucronate		Onobrychis
+	Keel not mucronate		(39)
39 (38)	Vexillum about twice the length of keel		Gueldenstaedtia
+	Vexillum less than twice the length of keel		(40)
40 (39)	Lateral nerves of leaflets numerous, closely parallel, extending to the margin and often united into a prominent marginal nerve (vexillum externally pilose)		Tephrosia
+	Lateral nerves of leaflets not as above		Astragalus
41 (31)	leaf simple or unifoliolate		(42)
+	Leaf trifoliolate		(43)
42 (41)	Leaf simple, eglandular		Tephrosia
+	Leaf unifoliolate, glandular punctate below		Flemingia
43 (41)	Style with tenuous lower part obsolete or long, upper portion barbate on the inner side		Vigna
+	Style not as above		(44)
44 (43)	Style abruptly curved through 90º just above the junction with the tenuous part, narrowed and slightly curved towards the apex, resembling a squarish hook		Macroptilium
+	Style not as above		(45)
45 (44)	Leaflets mostly toothed		(46)
+	leaflets not toothed		(49)
46 (45)	Petals persistent, the claws of wing and keel ± adnate to the staminal tube; base of the stipules encircling the stem		Trifolium
+	Petals caducous, not attached to the staminal tube, base of stipule usually not encircling the stem		(47)
47 (46)	Fruit spirally coiled		Medicago
+	Fruit not spirally coiled		(48)
48 (47)	Fruit more than 3 times as long as the calyx, if less than the inflorescence rachis not elongated		Trigonella
+	Fruit less than 3 times as long as the calyx, straight, inflorescence axis elongated		Melilotus
49 (45)	Stipels glandular, keel petal much shorter than the vexillum		Erythrina
+	Stipels not glandular, keel petal not as above		(50)
50 (49)	Leaflets glandular		(51)
+	Leaflets eglandular		(53)
51 (50)	Fruit 4 or more ovuled		Cajanus
+	Fruit 1-3-ovuled		(52)
52 (51)	Shrubs with fasciculate dense sessile axillary inflorescences, fruit oblong-ovoid, c. 9-13 x 6 mm, densely covered with dark red globules		Flemingia
+	Herbs or undershrubs, mostly with pedunculate inflorescence or if sessile not dense axillary and fasciculate, fruit flattened, not bearing red globules		Rhynchosia
53 (50)	Fruit suborbicular, crested or prickly		Onobrychis
+	Fruit linear or oblong, straight of falcate		Glycine