- Ecuador Phytolith Database - - Presents diagnostic phytoliths in the flora of Ecuador studied by Dr Deborah M. Pearsall and students at the University of Missouri's Paleoethnobotany Laboratory.
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- Plant Fossil Record Database - - Descriptions and occurrences of many thousands of extinct plants. Genus distributions can be plotted on paleogeographic maps. Maintained by the International Organisation of Palaeobotany.
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