Contributions to the knowledge of sieve-element plastids inGunneraceae and allied families

P-type sieve-element plastids were found in theGunneraceae, while S-type plastids are present in theHaloragaceae andHippuridaceae. The specific characters of the sieve-element plastids (e.g., their size and the morphology of their contents) are discussed in relation to other taxa of theRosidae containing P-type plastids and to the systematic position of theGunneraceae. Contributions to the Knowledge of P-Type Sieve-Element Plastids in Dicotyledons, III. — For other parts of this series see (I.:)Behnke (1982 b) and (II.:)Behnke (1985).