Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/44423
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Type: | Journal article |
Title: | Morphology of Hydatellaceae, an anomalous aquatic family recently recognized as an early-divergent angiosperm lineage |
Author: | Rudall, P. Sokoloff, D. Remizowa, M. Conran, J. Davis, J. Macfarlane, T. Stevenson, D. |
Citation: | American Journal of Botany, 2007; 94(7):1073-1092 |
Publisher: | Botanical Soc Amer Inc |
Issue Date: | 2007 |
ISSN: | 0002-9122 1537-2197 |
Statement of Responsibility: | Paula J. Rudall, Dmitry D. Sokoloff, Margarita V. Remizowa, John G. Conran, Jerrold I. Davis, Terry D. Macfarlane and Dennis W. Stevenson |
Abstract: | The family Hydatellaceae was recently reassigned to the early-divergent angiosperm order Nymphaeales rather than the monocot order Poales. This dramatic taxonomic adjustment allows comparison with other early-divergent angiosperms, both extant and extinct. Hydatellaceae possess some monocot-like features that could represent adaptations to an aquatic habit. Ecophysiological parallels can also be drawn from fossil taxa that are known from small achene-like diaspores, as in Hydatellaceae. Reproductive units of Hydatellaceae consist of perianthlike bracts enclosing several pistils and/or stamens. In species with bisexual reproductive units, a single unit resembles an "inside-out" flower, in which stamens are surrounded by carpels that are initiated centrifugally. Furthermore, involucre development in Trithuria submersa, with delayed growth of second whorl bracts, resembles similar delayed development of the second perianth whorl in Cabomba. Several hypotheses on the homologies of reproductive units in Hydatellaceae are explored. Currently, the most plausible interpretation is that each reproductive unit represents an aggregation of reduced unisexual apetalous flowers, which are thus very different from flowers of Nymphaeales. Each pistil in Hydatellaceae is morphologically and developmentally consistent with a solitary ascidiate carpel. However, ascidiate carpel development, consistent with placement in Nymphaeales, is closely similar to pseudomonomerous pistil development as in Poaes. |
Keywords: | angiosperm flower Hydatella Hydatellaceae inflorescence ontogeny pseudanthium Trithuria |
Description: | © 2007 Botanical Society of America, Inc. |
DOI: | 10.3732/ajb.94.7.1073 |
Published version: | http://www.amjbot.org/cgi/content/abstract/94/7/1073 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute publications |
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hdl_44423.pdf | 2.74 MB | Publisher's PDF | View/Open |
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