What is a lithnode?

In botany, a lithnode is a stem node found in some monocotyledonous plants, such as bamboos and grasses, where short internodes are produced from the base of the culms or stems. These internodes are often swollen and bear roots, which help to anchor the plant in the soil and provide stability. Lithnodes are specialized structures that allow these plants to adapt to various environments, including rocky or shallow soil conditions.