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Xerophytic floras typically may have a large number of species in which a hypodermal layer is well-developed. As the name suggests, these special- ized cells are present to the inner side of and next to the epidermal cells. The cells within hypodermal layers typically contain few chloroplasts and are often thick-walled. Hypodermal cells are derived from cortical cells, not the epidermis. Some species with xerophytic anatomy such as Nerium olean-der have a multiple layered hypodermis.
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