The genusBuxus (Buxaceae): Aspects of its differentiation in space and time |
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Authors: | Egon köhler Paul Brückner |
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Institution: | (1) Bereich Botanik und Arboretum des Museums für Naturkunde, Humboldt-Universität Berlin, Späthstrasse 80/81, DDR-1195 Berlin, German Democratic Republic |
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Abstract: | Trends of pollen grain aperture evolution and exine characters as well as characters of leaf venation, petiole and axial vascularization are briefly described and related to geographical distribution and classification ofBuxus. A review of fossil records is given. Three major taxonomic groups can be delimitated within the genus, and aspects of their relationships and chorogenesis are presented. The level of differentiation, the pattern of distribution and the fossil record speak in favour of an ancient origin of the genus. |
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Keywords: | Angiosperms Buxaceae Buxus Pollen morphology leaf venation fossil records systematics evolution chorogenesis |
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