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A survey of gynoecial structure is undertaken within these two families, and they are interpreted in light of phylogenetic comparison of placentation types among all angiosperms.
Gynoecial structure, especially the placentation type, of the two families has been variously interpreted. Evolutionary relationships of the Vitales (the economically important Vitaceae and its sister family Leeaceae) within the rosids have been difficult to resolve.
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