1	"Flowers radially symmetric; petals valvate in bud, often united at the base; stamens (5,10) or many; leaves usually bipinnate; inflorescences often dense heads or racemes"	Mimosoideae
1	"Flowers bilaterally symmetric; petals imbricate in bud either all free or some unted; stamens (5) 10; leaves varied but usually not bipinnate"	2
2	"Upper petals at least partly covered by the wing petals in bud (unless wing petals absent); sepals often free; stamens usually free"	Caesalpinoideae
2	"Upper petals at least partly covering the wing petals In bud; sepals united at the base; 9 or 10 stamens usually united by their filaments"	Papilionoideae