1	Fruit glabrous		(6)
+	Fruit pubescent (at least when young)		(2)
2 (1)	Fruit 2-seeded, c. 4 mm or less long		(3)
+	Fruit more than 2-seeded		(4)
3 (2)	Stem less than 30 cm tall; petiole less than 1 cm long		Crotalaria medicaginea var. medicaginea
+	Stem more than 30 cm tall; petiole more than 1 cm long		Crotalaria medicaginea var. luxurians
4 (2)	Fruit 10-15-seeded		Crotalaria juncea
+	Fruit 6 or less seeded		(5)
5 (4)	Fruit 4-6 mm wide, leaf trifoliolate when present		Crotalaria persica
+	Fruit 4 mm or less wide, leaf simple		Crotalaria burhia
6 (1)	Corolla about half the size of calyx (calyx c. 1.8-2.5 cm long)		Crotalaria calycina
+	Corolla more than half the length of the calyx (calyx less than 2 cm long)		(7)
7 (6)	Flower 1 cm or less long		(9)
+	Flower more than 1 cm long		(8)
8 (7)	Bract linear, subulate, 6 mm or less long		Crotalaria retusa
+	Bract ovate, c. 10 mm or more long		Crotalaria spectabilis
9 (7)	Flower sessile		(10)
+	Flower pedicellate		(11)
10 (9)	Leaf more than 4.5 cm long, fruit c. 1.5 cm long (calyx more hairy)		Crotalaria sessiliflora subsp. sessiliflora
+	Leaf 3.5 cm or less long, fruit c. 1.0 cm long (calyx less hairy)		Crotalaria sessiliflora subsp. hazarensis
11 (9)	Inflorescence less than 5-flowered		Crotalaria albida
+	Inflorescence more than 5-flowered		(12)
12 (11)	Fruit more than 1.7 cm long (c. 1.8-3.2 cm long)		Crotalaria mysorensis
+	Fruit less than 1.7 cm long (c. 1.2-1.6 cm long)		Crotalaria prostrata