Which type of leaf structure typically has leaflets arranged along a central stem?

The type of leaf structure characterized by leaflets arranged along a central stem is known as a compound leaf. In this configuration, multiple leaflets emerge from a central petiole, or stem, giving the leaf a divided appearance. This arrangement can enable greater light capture efficiency and can allow the plant to withstand high winds, as the leaflet structure can reduce wind resistance.

On the other hand, a simple leaf has a single blade that is not divided into smaller leaflets. A forked leaf typically refers to a structure that may split into two at the end, which is not the same as having leaflets. A veined leaf describes the presence of veins within the leaf, which can occur in both simple and compound leaves, but it does not specifically indicate the arrangement of leaflets along a central stem. Therefore, the defining feature of a compound leaf is its arrangement of multiple leaflets, making it the correct answer to the question.