1	"Plants with spines "	2
1	"Plants without spines "	3
2	"Trees; spines branched or simple and straight or absent; leaves bipinnate and/or pinnate "	Gleditsia
2	"Shrubs, or scramblers; prickles bent; leaves bipinnate "	Caesalpinia
3	"Leaves mostly pinnate but occasionally bipinnate on same tree; flowers greenish yellow, in spike-like narrow clusters "	Gleditsia
3	"Leaves and flowers not as above "	4
4	"Leaves bipinnate "	Delonix
4	"Leaves pinnate or simple "	5
5	"Leaves simple "	6
5	"Leaves pinnate "	7
6	"Leaf blade with 2 distinct lobes "	Bauhinia
6	"Leaf blades entire "	Cercis
7	"Flowers without petals "	Ceratonia
7	"Flowers with petals "	8
8	"Trees with flowers mostly red; fruit valves splitting away from the pod rim "	Schotia
8	"Mostly shrubs, flowers yellowish, rarely pink to red; pods not splitting as above "	9
9	"Filaments of the 3 stamens facing the axis S-shaped and much longer than their anthers, which open by slits; anthers attached to the filaments in the centre "	Cassia
9	"Filaments of all stamens straight or curved, not more than twice as long as the anthers or if so the anthers opening by pores; anthers attached to filaments at the base "	Senna