Vegetative key to the families >

PHYLLODES present with a raised or depressed extra-floral nectary on the adaxial edge, hanging or standing with the nectary uppermost. (A few species of Acacia with exceptional additional structures are included in the key below) (Mimosoideae Fabaceae
Flowers irregular
Prickles or thorns present
Erect trees with straight branched thorns Gleditsia