What does "alternate" mean in leaf arrangement?

In the context of leaf arrangement, "alternate" specifically refers to the position of leaves along the stem. The correct interpretation is that there is a single leaf at each node, meaning that leaves are spaced out along the stem with one leaf attached at each point where the stem develops a leaf (the node). This arrangement allows for optimal sunlight exposure and space for the leaves to grow without overlapping significantly, which is beneficial for photosynthesis.

Other arrangements, such as opposite (two leaves at each node) or whorled (three or more leaves around the stem), do not align with the definition of "alternate." Therefore, recognizing that "alternate" strictly means a single leaf per node is essential to understanding how this arrangement differs from others in botanical terminology.