Botanical Journal of the Linnean Society, 72: 115‑148. With 8 plates and 3 figures


February 1976


Reproduced here with the permission of the author


The floral anatomy of Victoria Schomb. (Nymphaeaceae)*




Department of Biology, Southwest Texas State University, San Marcos, Texas 78666, U.S.A.


Accepted for publication November 1975


The vasculature and development of the flower of Victoria Schomb. are described. The vasculature is basically similar to that found in other genera of the Nymphaeaceae sensu stricto (e.g. Nymphaea L. and Nuphar Sm.). The early development of the flower is similar to that of a hypogenous flower, but meristematic activity shifts from the apex to the periphery in the form of an intercalary ring meristem. The innermost appendicular organs, including the gynoecium, arise by differentiation of tissues formed by this intercalary ring meristem. Evidence is assembled from the mature vasculature and developmental studies: (a) to refute Troll's interpretation that receptacular strips of tissue occur between the carpels and that the outer ovary wall is totally receptacular; (b) to propose that the occurrence of epeltate carpels in Victoria, as correctly described by Troll, has been phylogenetically 'read' in the wrong direction; (c) to propose that the flower of Victoria has evolved by (1) the adnation and connation of the proximal portions of the appendicular organs which now envelop the syncarpous gynoecium and (2) the concomitant condensation from a primitive ranalian floral apex.




Introduction                                                                                                                                                  1

Methods and materials                                                                                                                                 1

Table 1                                                                                                                                                          1


            Gross morphological aspects                                                                                                           2

            Anatomy of the peduncle and receptacle                                                                                         2

            Vascular supply to the dorsal carpellary regions and the appendicular organs                               3

            The ventral carpellary bundle system and the residual stele                                                           3

            Various aspects of organogenesis and histogenesis                                                                          4

            The fruit of Victoria                                                                                                                         5


            The origin of the flower‑The 'primitive' angiosperms,                                                                     5

            The Ranales‑floral anatomy                                                                                                             5

            The flower of Victoria                                                                                                                      6

            Familial status of the Nymphaeaceae                                                                                              6

Acknowledgements                                                                                                                                      6

         References                                                                                                                                                    7


*Morphological studies of the Nymphaeaceae, VIII. For previous titles in this series, see "References" under Moseley, M. F.

This investigation represents a portion of a thesis presented to the Graduate Division of the University of California, Santa Barbara, in partial fulfillment of the requirements for the Doctor of Philosophy degree.



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