Three types of diaphragms are produced in regular sequence by the basal intercalary meristem in the leaf of Sparganium eurycarpum Engelm. (Sparganiaceae). They bridge compartments formed by the collapse and disintegration of rib meristem derivatives. The adaptive nature of diaphragms, intercalary meristems, and linear photosynthetic organs is considered for emergent aquatic plants.
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Robert B. Kaul (1973) studied this question.
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