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-shaped protrusion on the inside of the junction of the blades and the leaves. Such as the undergraduate plant rice, etc. with leaf tongue. It can make the leaves tilt outwards, is conducive to receiving sunlight, and because of its growth site, can prevent insects, germs, rainwater and so on into the leaf barrel. The leaf tongue is the extension of the leaf, its size, shape and hairy, can be used as one of the classification basis. The leaf tongue of the undergraduate, commonly has torn leaf tongue, two deep cleavage tongue, short leaf tongue, with lashes leaf tongue and long leaf tongue and other
. Flaky appendages, also known as leaf tongues, on the near axis of the near-axis of the near-base of the nutritional leaves and spore leaves of certain ferns.