Rhizomatous is an adjective that describes a type of plant that has underground stems which grow horizontally and produce new shoots and roots, such as ginger or bamboo. Synonyms for rhizomatous include creeping, stoloniferous, runner-forming, and rootstalk. These words are all related to the way that the plant spreads and establishes itself in the soil. Other related terms might include invasive, tenacious, or vigorous, as rhizomatous plants are known for their ability to take hold and thrive in a variety of conditions. Overall, the adjective rhizomatous describes a unique mode of growth that is interesting to explore and understand in the context of plant biology.