What are the three main plants?
Based on these charactersitics most plants can be classified into three categories: herbs, shrubs and trees. Plants with green and tender stems are called herbs. They are usually short and may not have many branches. Some plants have the stem branching out near the base. The document describes 10 types of plants: flowering plants, shrubs, cacti, trees, succulents, water plants, ferns, grasses, herbs, and climbers/vines.Quick Revision Points for Classification of Plants Main plant groups: Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms. Angiosperms are divided into monocots (one cotyledon) and dicots (two cotyledons).