The term 'plant stalk' refers to the structure of a plant that supports its leaves and flowers. It is composed of four parts: a REED (4 letters), a STEM (4 letters), a PEDUNCLE (8 letters), and a stipe (5 letters). A REED is a thin, hollow STEM of a grass or other plant. A STEM is the main body of a plant, which supports the leaves and flowers. A PEDUNCLE is a STEM-like structure that supports a single flower or inflorescence. Finally, a stipe is a stalk or STEM that supports a frond, such as in ferns. Together, these four parts form the plant stalk, which provides support for the leaves and flowers of a plant.