Culms are the stems of grasses, sedges, and rushes. If you're looking for synonyms for this botanical term, there are several options to choose from. A common synonym is "stems," which refers to the aerial part of a plant that supports leaves, flowers, and fruits. Another option is "stalks," which are the thin vertical supports that hold up the leaves or flowers of a plant. "Straws" can also be used to describe culms, which are thin, rigid tubes made of a variety of materials, including plastic, metal, and paper. Lastly, "shoots" can be used to describe the new growth of plants that come from the culms.