1	"At least 1 petal present"	2
1	"No petals present"	15
2	"Leaves simple or once-pinnate"	3
2	"Leaves bipinate"	8
3	"Sepals valvate or open in bud"	"Cercis {Cercis siliquastrum}"
3	"Sepals imbricate in bud"	4
4	"Leaves simple, variously deeplybilobed"	Bauhinia
4	"Leaves compound"	5
5	"Anthers opening by terminal pores, the loculi attached at or near the base"	Cassia
5	"Anthers opening lengthwise by slites, often attached near the middela and more or less versatile"	6
6	"Stamens with functional anthers 3, filaments connate for much of their length into a tube but open above"	"Tamarindus {Tamarindus indica}"
6	"Stamens with functional anthers 10, free, filaments pilose at the base"	7
7	"Sepals free to the base or nearly so, not forming a distinct tube"	"Haematoxylon {Haematoxylon campechianum}"
7	"Sepals more or less united into a distinct tube"	"Schotia {Schotia brachypetala}"
8	"Calyx lobes or teeth imbricate"	9
8	"Calyx lobes valvate"	14
9	"Leaf rachises very short and ending in a sharp, spinelike point"	"Parkinsonia {Parkinsonia aculeata}"
9	"Leaf rachises not endin in a sharp, spinelike point"	10
10	"Branchlets and leaf rachises prickly"	11
10	"Branchlets and leaf rachises not prickly"	12
11	"Fruits not winged, often filled with pulp between the seeds"	Caesalpinia
11	"Fruits winged lengthwise along the upper suture"	"Mezoneuron {Mezoneuron enneaphyllum}"
12	"Ovaries shortly stipitate"	"Haematoxylon {Haematoxylon campechianum}"
12	"Ovaries sessile"	13
13	"Fruits indehiscent, with a thin wein along the margins, as if 2-winged"	"Peltophorum {Peltophorum pterocarpum}"
13	"Fruits dehiscent or indehiscent, not even apparently winged"	Caesalpinia
14	"Fertile stamens 10; trunks and branches not spiny"	Delonix
14	"Fertile stamens 6-10; trunks and branches armed with stout, simple or branched spines"	Gleditsia
15	"Calyx segments 4"	"Saraca {Saraca asoca}"
15	"Calyx segments 5"	16
16	"Ovules numerous, most maturing into seeds; fruits with pulpy areas between the seeds"	"Ceratonia {Ceratonia siliqua}"
16	"Ovules 2, only 1 maturing into a seed; fruits 2-valved"	"Hardwickia {Hardwickia bipinata}"