Plants that have leaves with parallel veins are typically classified as monocots, short for monocotyledons. A common example of such plants includes grasses, lilies, and orchids. The characteristic feature of these plants is their leaf structure, where the veins run parallel to each other from the base of the leaf to the tip.
Parallel venation is a distinct trait that helps differentiate monocots from dicots (dicotyledons), which generally have a branching or net-like pattern of veins. The parallel arrangement is efficient for structural support and allows for quick transportation of water and nutrients through the leaf.