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The dermal layer consists of two parts. The epidermis is a one-cell thick, skinlike tissue that covers the entire plant. In woody plants, this tissue is stiffer and more corky. The epidermis secretes a waxy substance that coats the outside of the leaf, the cuticle. Tiny openings, called stomata, dot the surface of the leaf. The stomata open and close to release water and gasses from the plant.
Tropical plants grow where there is little danger of frost, but often excessive heat. There are a number of plants that produce waxy leaves in this environment. The cycads, for example, are a group of palmlike trees with a stout central trunk. Hardy in USDA zones 8 to 10, cycad leaves are thick, leathery and waxy.