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Vascular anatomy of the flowers of Calandrinia grandiflora Lindl. and Calandrinia compressa Schrad. and the comparative flower morphology of the Portulacaceae



Vascular anatomy of the flowers of Calandrinia grandiflora Lindl. and Calandrinia compressa Schrad. and the comparative flower morphology of the Portulacaceae



Feddes Repertorium 10(1-2): 75-88



Flower morphology and vascular anatomy of Calandrinia grandiflora LINDL. and Calandrinia compressa SCHRAD. (Portulacaceae) have been investigated. Both species still possess a well-developed system of axial bundles in the receptacle. The investigation of vascular anatomy prove the starting form of flower in the family to have a bracteolar calyx and primarily simple perianth transformed into corolla. Neither ontogenetical nor morphological and anatomical evidence permit to accept a hypothesis about the primitiveness of an obhaplostemonous or diplostemonous androecium, that must be primarily a polymerous one. A pronounced development of a symplicate region seems to be an important tendency in the evolution of the Portulacaceae gynoeceum with synascidiate, symplicate, hemisymplicate and apocarpous regions.

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Accession: 009718711

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