As adjectives the difference between infrageneric and intergeneric
is that infrageneric is (taxonomy) pertaining to division or subclassification within a biological genus of organisms while intergeneric is (biology) between organisms of different genera.
infrageneric
English
Adjective
(-)
(taxonomy) Pertaining to division or subclassification within a biological genus of organisms
intergeneric
English
Adjective
(-)
(biology) Between organisms of different genera