Most plants have similar external features such as leaves, stems and flowers. Certain external features of these parts can be similar or different. Plants can be grouped according to the external features. Plants which are similar in a certain external feature can be put in the same group. Plants can be also be grouped according to their similarities in other external features such as thorns and leaves.
1. Flowering Plants
2. Non-Flowering Plants
3. Woody Stem
4. Non-Woody Stem
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