The diversity in a plant community resulting from the variety of physical forms of the plants within the community (such as the layering or tiering of the canopy of a forest from the groundlevel to the tops of the tallest trees).

The diversity of the composition, abundance, spacing, and other attributes of plants in a community.

A full range of sizes, shapes and characteristics of trees and the understorey in a forest.

(of a stream channel) - (3) within a stream channel, the diversity of objects that control water movement.

the diversity in a forest that provides a variety of forest habitats for plants and animals. These structures may include: dead and dying trees, both standing and on the ground; different crown heights; different tree species, such as hardwood and softwood; water; and a variety of soil types, etc.

Range of types of physical structure in a community that may provide habitats for species.