Leaves213-page7 - leaves or narrow linear leaves These...

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Leaves - 7 Some Leaf Variations Hydromorphic Leaves Floating Leaves Floating leaves will have stomata on the upper epidermis with air channels into the palisade parenchyma. The spongy mesophyll will be filled with huge air spaces (aerenchyma) Vascular tissue may be reduced, especially in the amount of xylem in the branching veins. Submerged Leaves Plants that grow completely underwater will typically have dissected
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Unformatted text preview: leaves, or narrow linear leaves. These shapes minimize resistance to water currents, and probably prevent damage to the leaf. • Some aquatic plants produce dissected leaves where submerged, and less dissected shapes when the leaves are produced above the surface of the water. They are a good example of environmental control of gene expression....
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