Abstract
Xyridaceae are a predominantly tropical family of five genera that exhibit two pollen morphologies often considered to be of taxonomic importance. Xyris comprises about 95% of the species and is characterized by medium to large, elliptic, sulcate pollen grains. The other pollen class is spheroidal grains without an evident aperture. Many of the species with spheroidal grains have remarkably large and ornamented pollen found to be species specific in earlier research. A scanning electron microscopy investigation of 23 taxa representing all genera with spheroidal pollen revealed new data to further distinguish the genera based on pollen characters. Reliable specific pollen characters need to be evaluated in a statistical study.
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Acknowledgments
A portion of this work was completed for my dissertation and I am grateful to Dennis Stevenson for his mentorship and support during the research. Numerous individuals and organizations provided logistic support for collecting in Venezuela, and I thank G. A. Romero and H. van der Werff for samples. Field work was supported by funding from The Explorers Club Exploration Fund, New York; The Fund for Neotropical Plant Research of The New York Botanical Garden; the International Association for Plant Taxonomy, and the City University of New York.
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Campbell, L.M. Pollen Morphology of Xyridaceae Systematic (Poales) and its Potential. Bot. Rev. 78, 428–439 (2012). https://doi.org/10.1007/s12229-012-9110-7
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DOI: https://doi.org/10.1007/s12229-012-9110-7