Sage: I choose a difficult one, it is not really clear to be whether the leaf margin is smooth or really finely serrated. Leaf itself is thick and soft and a bit grainy. Veins are very visible at the bottom. Lot of smell and taste.
Lemon Balm: The leaf margin is commensurately serrated. Veins are visible, when bruised they give off a typical aroma.
Grape: Grows in three parts-in-one by a incised leaf blade, the leaf margin is serrated, veins are pretty visible, even more at the bottom.