1	"Fruit tightly coiled; petals fused"	2
1	"Fruit not coiled; petals free"	3
2	"Inflorescence spike-like raceme, 4--8 cm; leaf hairy"	"Prosopis pubescens"
2	"Inflorescence head to spike-like raceme, < 4 cm; leaf glabrous or short-hairy"	"Prosopis strombulifera"
3	"Plant +- glabrous; 2&deg; leaflets (10)15--25 mm, length 7--9 &times; width"	"Prosopis glandulosa var. torreyana"
3	"Plant with short, dense hairs; 2&deg; leaflets 4--15 mm, length 3--4 &times; width"	"Prosopis velutina"