This document summarizes the key differences between monocotyledonous and dicotyledonous plants. Monocots typically have one cotyledon, flower parts in threes, one pore in pollen, adventitious roots, and parallel leaf veins without secondary growth. In contrast, dicots usually have two cotyledons, flower parts in fours or fives, three pores in pollen, roots developing from the radicle, divided but networked leaf veins, and often have secondary growth. Pictures are provided showing examples of monocot and dicot features.