1	"Filament sheaths 35-60 mm long, curved for most of their length; mature leaflets rarely less than 6 mm wide"	"Sesbania grandiflora"
1	"Filament sheaths less than 30 mm long, only upcurved near the tip; leaflets usually less than 6 mm wide"	2
2	"Banner petal appendages with acute free tips at least 0.5 mm long"	3
2	"Banner petal appendages without free tips or with very short, blunt free tips"	5
3	"Blades of banner petals broadly cordate, wider than long"	"Sesbania sesban"
3	"Blades of banner betals more or less oblong, their length equaling or greater than their width"	4
4	"Inflorescences with 3-6 flowers; peduncles less than 2 cm long; pods thicker at the centre than at the edges"	"Sesbania somalensis"
4	"Inflorescences usually with 5-12 flowers; peduncles more than 2 cm long; pods as thick at the edges as in the centre"	"Sesbania quadrata"
5	"Styles pubescenet"	"Sesbania geenwayi"
5	"Styles glabrous"	6
6	"Leaflets pubescent at least on the lower surface"	"Sesbania sericea"
6	"Leaflets glabrous except when very young"	7
7	"Pods not or only slightly torulose; peduncles, petiolesm and often also the stemes, with small prickles"	"Sesbania bispinosa"
7	"Pods torulose; peduncels, petioles, and stems without prickles"	"Sesbania leptocarpa"