1	Plants armed		(2)
+	Plants unarmed		(3)
2 (1)	Branches spiny, leaf simple, fruit subterete, not enclosed in calyx		Alhagi
+	Leaf raches spiny, leaf compound, fruit compressed, enclosed in calyx		Ebenus
3 (1)	Fruit stipitate (seeds 3 or less per fruit, leaf 3 or 1-foliolate)		Taverniera
+	Fruit sessile		(4)
4 (3)	Fruit jointed		(5)
+	Fruit not jointed, mostly crested or prickly, 2-1-seeded		Onobrychis
5 (4)	Fruit with prickly sutures		Stracheya
+	Fruit not as above		Hedysarum