Simplify the following text for a Grade 10 native English-speaking person.
Original: His five-volume Historiae animalium ( 1551-1558 ) is considered the beginning of modern zoology , and the flowering plant genus Gesneria ( Gesneriaceae ) is named after him .
Simplified: His five-volume Historiae animalium ( 1551 â `` 1558 ) is a forerunner of modern zoology . The flowering plant genus Gesneria is named after him .