1	"Leaves simple or appearing simple (reduced to phyllodes), entire or, usually, ±bilobed, sometimes deeply divided and apparently bifoliolate, not pungent-pointed"	2
1	"Leaves compound, rarely unifoliolate and then usually pungent-pointed apically"	3
2	"Leaves simple, entire, broadly ovate or cordate, or, more commonly, ±bilobed, sometimes divided almost to the base"	Bauhinia
2	"Leaves appearing simple (reduced to phyllodes), not broadly ovate or cordate"	Senna
3	"Leaves bipinnate"	4
3	"Leaves simply pinnate, rarely unifoliolate"	10
4	"Plants armed with spines or prickles"	5
4	"Plants not armed with spines or prickles"	7
5	"Leaf rachises spinescent; secondary rachises broadly winged and appearing flattened, almost phyllodial; leaflets caducous"	"Parkinsonia: Parkinsonia aculeata"
5	"Leaf rachises not spinescent; secondary rachises neither broadly winged nor flattened; leaflets not caducous"	6
6	"Leaflet margins conspicuously crenate or crenulate-denticulate; flowers greenish, unisexual or bisexual, the plants dioecious or polygamous, regular; stamens 5–7"	"Gleditsia: Gleditsia triacanthos"
6	"Leaflet margins not conspicuously crenate or crenulate-denticulate; flowers not greenish, usually bisexual, irregular or bilateral; stamens 10"	"Caesalpinia: Caesalpinia major"
7	"Leaflets alternate; petals to 6 mm long; flowers arranged in cylindrical spikes, cream to greenish yellow"	"Erythrophleum: Erythrophleum chlorostachys"
7	"Leaflets opposite; petals 1.3–6.5 cm long; flowers not arranged in cylindrical spikes, yellow, white, orange or scarlet"	8
8	"Petals yellow, rusty-hirsute within basally; stigma broadly peltate; pods elliptic-oblong, with a distinct wing along each margin, indehiscent"	"Peltophorum: Peltophorum pterocarpum"
8	"Petals scarlet, yellow, orange, or white, not rusty-hirsute within basally; stigma not broadly peltate; pods various but lacking a wing along each margin, indehiscent or dehiscent"	9
9	"Petals all scarlet or sometimes upper one orange, yellowish or whitish; pods linear-oblong, woody, 20–50 cm long, dehiscing longitudinally into 2 valves"	"Delonix: Delonix regia"
9	"Petals yellow or white; pods various, if woody less than 15 cm long, longitudinally dehiscent or indehiscent"	"Caesalpinia: Caesalpinia major"
10	"Leaves imparipinnate, digitate or unifoliolate"	11
10	"Leaves paripinnate"	12
11	"Fertile anthers 2; style filiform; leaves imparipinnate, digitate or unifoliolate; leaflets 1–17, usually pungent-pointed apically"	Labichea
11	"Fertile anthers 3; style dilated into a boat-shaped petaloid limb; leaves imparipinnate; leaflets 3–80, not pungent-pointed apically"	Petalostylis
12	"Branches, leaves and trunks unarmed"	13
12	"Branches, leaves or trunks armed with spines"	16
13	"Well-developed petals 3; fertile stamens 3, alternating with 5 sterile teeth or short filaments; filaments united for about half of their length into a tube"	"Tamarindus: Tamarindus indica"
13	"Well-developed petals 5; fertile stamens 5–80; filaments free or united basally only"	14
14	"Filaments of the 3 abaxial stamens sigmoidally curved and many times longer than their anther which dehisces by slits, often nodulate medially"	"Cassia: Cassia fistula"
14	"Filaments of all stamens straight or arcuately curved, either shorter than or not more than twice as long as their anther, if longer then the anther dehiscing by apical pores"	15
15	"Anther thecae glabrous; pods either indehiscent or dehiscing along one or both sutures; valves not coiling"	Senna
15	"Anther thecae ciliolate along the sutures; pods elastically dehiscent; valves coiling"	Chamaecrista
16	"Leaf rachises spinescent; secondary rachises broadly winged and appearing flattened, almost phyllodial; leaflets caducous"	"Parkinsonia: Parkinsonia aculeata"
16	"Leaf rachises not spinescent; secondary rachises neither broadly winged nor flattened, almost phyllodial; leaflets not caducous"	"Gleditsia: Gleditsia triacanthos"