… the main stem of a grass inflorescence or the central axis of a compound leaf or fern frond

… the “stem” of a compound leaf.

… in the Asteraceae/Compositae, the small flowers that most of us might think of as “petals”. In a sunflower, for example, these are the yellow, showy florets around the outside of the disc.

… the vegetative tissues near the end of reproductive stems to which reproductive organs are attached

… the vegetative tissues at the top of the flower stem (peduncle) and just below or surrounding the reproductive organs (stamens, pistils etc.).

… having and spreading by rhizomes

… a modified subterranean plant stem that sends out roots and shoots from its nodes

… modified underground stems capable of sending out roots or a new shoot.

… wetlands adjacent to rivers or streams

… a circular cluster of leaves, usually at ground level on a stem that elongates enough only to add another leaf.