Answer
The classification of plants by John Ray was predominantly based on the characteristics of their leaves. He classified plants into two primary groups: Dicotyledons and Monocotyledons. Dicotyledons possess two seed leaves, have net-like leaf veins, and their flower parts are usually in multiples of four or five. On the other hand, Monocotyledons have one seed leaf, parallel leaf veins, and their flower parts are typically in multiples of three.