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(American Journal of Botany. 1999;86:1027-1037.)
© 1999 Botanical Society of America, Inc.

Phylogenetic relationships of the Hamamelidaceae inferred from sequences of internal transcribed spacers (ITS) of nuclear ribosomal DNA1

Jianhua Li 2, 5, A. Linn Bogle 3 and Anita S. Klein 4

2Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts 02138; 3Department of Plant Biology, University of New Hampshire, Durham, New Hampshire 03824; and 4Department of Biochemistry and Molecular Biology, University of New Hampshire, Durham, New Hampshire 03824

Intergeneric relationships in the Hamamelidaceae have long been controversial. In this study, sequences of the internal transcribed spacers of nuclear ribosomal DNA were used to reconstruct the phylogeny for the Hamamelidaceae. Three major clades were recognized in the ITS-based phylogenetic tree: (1) Mytilaria-Exbucklandia-Rhodoleia, (2) Disanthus, and (3) the Hamamelidoideae. Within the Hamamelidoideae there were three well-supported lineages: (1) Corylopsis-Loropetalum-Tetrathyrium-Maingaya-Matudaea, (2) Eustigmateae sensu Endress, plus Molinadendron-Dicoryphinae, and (3) Hamamelis-Fothergilleae sensu Endress, excluding Matudaea and Molinadendron. The Exbucklandioideae sensu Endress were not monophyletic, nor were the tribes in the Hamamelidoideae in their current circumscriptions except for the Corylopsideae. Strap-shaped petals, apetaly, and wind pollination have evolved three times independently in the Hamamelidaceae s.s. (Hamamelidaceae minus Altingioideae), suggesting that homoplasy should be considered in future classifications of the family.

Key Words: Hamamelidaceae • ITS DNA sequences • homoplasy • phylogeny




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