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"	4
2	"Leaves appearing simple (reduced to phyllodes), not broadly ovate or cordate"	Senna
2	"Leaves simple, entire, broadly ovate or cordate, or, more commonly, ±bilobed, sometimes divided almost to the base"	3
3	"Leaves ±bilobed, sometimes divided almost to the base; petals 9–50 mm long; flowers solitary or few to many in terminal or subterminal and axillary racemes, corymbs or panicles"	Bauhinia
3	"Leaves entire, broadly ovate or cordate; petals to 8 mm long; flowers crowded in dense spike-like racemes in terminal, panicle-like groups, occasionally solitary in upper axils"	"Barklya {Barklya syringifolia}"
4	"Leaves bipinnate"	5
4	"Leaves simply pinnate, rarely unifoliolate"	12
5	"Plants armed with spines or prickles"	6
5	"Plants not armed with spines or prickles"	9
6	"Leaf rachises spinescent; secondary rachises broadly winged and appearing flattened, almost phyllodial; leaflets caducous"	"Parkinsonia {Parkinsonia aculeata}"
6	"Leaf rachises not spinescent; secondary rachises neither broadly winged nor flattened; leaflets not caducous"	7
7	"Leaflet margins conspicuously crenate or crenulate-denticulate; flowers greenish, unisexual or bisexual, the plants dioecious or polygamous, regular; stamens 5–7"	"Gleditsia {Gleditsia triacanthos}"
7	"Leaflet margins not conspicuously crenate or crenulate-denticulate; flowers not greenish, usually bisexual, irregular or bilateral; stamens 10"	8
8	"Plants armed with prickles or spines either on the branches, lower surface of leaf rachises or pods; leaflets not cuneate-obovate or obcordate; ovary 1–10-ovulate; pods opening along the sutures or flattened and indehiscent"	Caesalpinia
8	"Plants armed with a spine in the axils of some leaves; leaflets cuneate-obovate or obcordate; ovary 2–3-ovulate; pods opening down the middle of the valves"	"Haematoxylum {Haematoxylum campechianum}"
9	"Leaflets alternate; petals to 6 mm long; flowers arranged in cylindrical spikes, cream to greenish yellow"	"Erythrophleum {Erythrophleum chlorostachys}"
9	"Leaflets opposite; petals 1.3–6.5 cm long; flowers not arranged in cylindrical spikes, yellow, white, orange or scarlet"	10
10	"Petals yellow, rusty-hirsute within basally; stigma broadly peltate; pods elliptic-oblong, with a distinct wing along each margin, indehiscent"	"Peltophorum {Peltophorum pterocarpum}"
10	"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"	11
11	"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}"
11	"Petals yellow or white; pods various, if woody less than 15 cm long, longitudinally dehiscent or indehiscent"	Caesalpinia
12	"Leaves imparipinnate, digitate or unifoliolate"	13
12	"Leaves paripinnate"	16
13	"Fertile anthers 2 or 3"	14
13	"Fertile anthers 4 or more"	15
14	"Fertile anthers 2; style filiform; leaves imparipinnate, digitate or unifoliolate; leaflets 1–17, usually pungent-pointed apically"	Labichea
14	"Fertile anthers 3; style dilated into a boat-shaped petaloid limb; leaves imparipinnate; leaflets 3–80, not pungent-pointed apically"	Petalostylis
15	"Stipules broadly ovate; inflorescence paniculate, petals present; fruits winged along upper suture"	"Storckiella {Storckiella australiensis}"
15	"Stipules slender; inflorescence racemose, petals absent; fruits not winged along the upper suture"	Crudia
16	"Branches, leaves and trunks unarmed"	17
16	"Branches, leaves or trunks armed with spines"	26
17	"Petals absent"	18
17	"Petals present, 1–5"	19
18	"Stamens 8–10; sepals 4"	Crudia
18	"Stamens 5; sepals 5"	"Ceratonia {Ceratonia siliqua}"
19	"Only 1 petal developed, the others rudimentary or absent"	20
19	"2–5 petals developed"	21
20	"Leaflets in (1–) 2 (–3) pairs; stipules not foliaceous; fertile stamens 3; pods oblong; valves lacking spines"	"Intsia {Intsia bijuga}"
20	"Leaflets in 3 pairs; stipules foliaceous; fertile stamens 2; pods ovate or elliptic; valves usually armed with spines"	"Sindora {Sindora supa}"
21	"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}"
21	"Well-developed petals 5; fertile stamens 5–80; filaments free or united basally only"	22
22	"Fertile stamens 15–80; young leaves originating from large (to 9 cm long) cone-shaped buds covered with imbricate scales"	"Maniltoa {Maniltoa lenticellata}"
22	"Fertile stamens 5–10; young leaves not originating from large (to 9 cm long) cone-shaped buds"	23
23	"Leaflets in 2 pairs; anther thecae dehiscing longitudinally; fruits obliquely subcircular with a lateral beak, rugose"	"Cynometra {Cynometra iripa}"
23	"Leaflets in 1–80 pairs; anther thecae dehiscing by apical or basal pores or short slits; fruits not obliquely subcircular with a lateral beak and rugose"	24
24	"Filaments of the 3 abaxial stamens sigmoidally curved and many times longer than their anther which dehisces by slits, often nodulate medially"	Cassia
24	"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"	25
25	"Anther thecae glabrous; pods either indehiscent or dehiscing along one or both sutures; valves not coiling"	Senna
25	"Anther thecae ciliolate along the sutures; pods elastically dehiscent; valves coiling"	Chamaecrista
26	"Leaf rachises spinescent; secondary rachises broadly winged and appearing flattened, almost phyllodial; leaflets caducous"	"Parkinsonia {Parkinsonia aculeata}"
26	"Leaf rachises not spinescent; secondary rachises neither broadly winged nor flattened, almost phyllodial; leaflets not caducous"	27
27	"Spines simple or branched; leaflet margins distinctly crenate or crenulate-denticulate; stamens 5–7; fruit indehiscent"	"Gleditsia {Gleditsia triacanthos}"
27	"Spines simple; leaflet margins entire but often deeply emarginate apically; stamens 10; fruit splitting longitudinally along the middle of each valve"	"Haematoxylum {Haematoxylum campechianum}"