What term describes a group of flowers or leaves that grows on a single stem?

The term that accurately describes a group of flowers or leaves growing on a single stem is "cluster." In botany, a cluster refers to a group of flowers or fruits that are borne closely together on the same stem or branch, which can enhance the aesthetic appeal and ecological effectiveness of the plant. This arrangement can facilitate pollination and fruit development, as well as support the plant’s reproductive strategy.

In contrast, while "clump" refers to a dense grouping of plants that are often rooted together, it does not specify that the grouping is on a single stem. "Clone" relates to a genetically identical organism produced asexually, and "cambium" refers to a layer of tissue in plants that contributes to growth. These terms do not convey the specific idea of flowers or leaves being grouped on a single stem, making "cluster" the most fitting choice for this question.