Single refers to an order containing a single leaf or a stem and leaves attached to a single (Petiole) than out of the stems or branches, such as sugar cane, bananas.
Leaves means leaves with a leaf or leaves only a single sheet attached to the petiole (Petiole) break off from the trunk or branches, such as sugarcane, banana leaves.
Single leaf mean leaf leaves only a single sheet or one attached to the petiole (Petiole) to break out from the trunk or branches, such as sugar cane leaves A banana.