DENDROLOGY

Detailed explanation-1: -Botanists use descriptions and drawings of plant parts as one of the main ways to identify a plant. By grouping plants with similar characteristics, evolutionary trends can be observed, and we can learn more about common plants. One example is the observation that most, but not all, plants produce flowers.

Detailed explanation-2: -Presence or absence of a differentiated body-root, stem and leaf. Presence or absence of vascular tissues-xylem and phloem. Presence or absence of seeds-cryptogams and phanerogams.