1	Leaf trifoliolate		(2)
+	Leaf with more than 3 leaflets		(6)
2 (1)	Leaf pinnately trifoliolate, flowers whitish, pinkish, yellowish white, red or red tinged with orange		(3)
+	Leaf palmately trifoliolate, flowers yellow, fruit with more or less winged sutures		Laburnum
3 (2)	Leaves present at the time of flowering, pod thin strap-shaped, indehiscent		Dalbergia
+	Flowering when branches are more or less leafless, pod not as above		(4)
4 (3)	Fruit jointed		Ougeinia
+	Fruit not jointed		(5)
5 (4)	Keel petal much shorter than the vexillum, flowers red		Erythrina
+	Keel petal longer than or equal to the vexillum, flowers red tinged with orange		Butea
6 (1)	Leaf paripinnate		Sesbania
+	Leaf imparipinnate		(7)
7 (6)	Stipules spinescent		Robinia
+	Stipules not spinescent		(8)
8 (7)	Leaflets 11-35		(9)
+	Leaflets 5-9		(10)
9 (8)	Fruit moniliform		Sophora
+	Fruit subfalcate, woody, coriaceous, spongy between seeds		Castanospermum
10 (8)	Fruit moniliform		Sophora
+	Fruit not moniliform		(11)
11 (10)	Fruit linear 6.5-9 cm long, 1.5 cm broad		Millettia
+	Fruit 3.5-5.0 cm long, 1.7-2.5 cm broad. usually 1-seeded		Pongamia