Final answer:
Grass plants are classified into bunching or sod-forming types. Bunching grasses grow in tufts and have spaces between them, while sod-forming grasses spread horizontally, forming a dense mat through stolons or rhizomes.
Step-by-step explanation:
Grass plants can be classified into two main categories: bunching or sod-forming types. The bunching type of grass grows in tufts or clumps and does not spread horizontally very much. This type of growth results in spaces between the individual plants. Examples include fescue and ryegrass.
On the other hand, sod-forming grasses have stems that grow horizontally, either above ground as stolons, or below ground as rhizomes. These types of grasses create a dense mat that covers the ground more evenly and are excellent for creating lawns with a uniform appearance. Examples include Bermuda grass and Kentucky bluegrass.