What is a rhizome?

A rhizome is defined as a type of stem that grows horizontally underground. It produces roots and shoots at various points along its length, which allows it to spread and establish new plants. This method of vegetative reproduction is quite efficient in many grass species, enabling them to expand their coverage and thrive in different environments.

In contrast, the other options focus on different aspects of plant anatomy that do not accurately describe the function of a rhizome. For example, a stem that grows vertically above ground does not describe the horizontal growth and underground nature of a rhizome. Similarly, the mention of a type of grass leaf or a flowering part of the grass plant does not pertain to the characteristic growth pattern of rhizomes. These distinctions highlight why the understanding of rhizomes is essential in both botany and turf management, particularly in maintaining healthy grass areas.