| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| Weththasinghe, Bhagya | United States | 8327169213 | | bhagya@tamu.edu | | View |
| WHIPPLE, JENNIFER | United States | 406-599-4165 | | jennifer_whipple@nps.gov | Vascular plants of Yellowstone. | View |
| Więcław, Helena | Poland | +48-502146511 | | helena.wieclaw@usz.edu.pl | Taxonomy and ecology of Carex taxa | View |
| Williams, Tanisha | United States | | | tmw018@bucknell.edu | | View |
| WILLYARD, ANN M. | United States | 5015485073 | | willyard@hendrix.edu | Pines. | View |
| WILSON, CAROL A. | United States | 503-724-0834 | | cawilson@berkeley.edu | Iris (Iridaceae); Loranthaceae; Viscaceae | View |
| WINDHAM, MICHAEL D. | United States | 801-440-5458 | | michael.windham@duke.edu | Cytotaxonomy; pteridophytes; Brassicaceae (esp. Boechera & Draba). | View |
| WOJCIECHOWSKI, MARTIN F. | United States | 480-727-7767 | 480-727-7767 | mfwojciechowski@asu.edu | Leguminosae; molecular phylogenetics, community phylogenetics, evolution of development | View |
| WORCESTER, LINDSEY | United States | 785-216-0135 | | worcester.07@gmail.com | Systematics, phylogenetic, phylogenomics, polyploidy, economic botany, medicinal botany, horticulture, nomenclature, Trillium, Tilia | View |
| Xiang, Qiuyun (Jenny) | United States | 9195152728 | | jenny_xiang@ncsu.edu | Cornales, eastern Asian-eastern North American disjunct taxa; phylogenetics, biogeography, evo-devo of inflorescences, population and conservation genetics/genomics | View |
| YATSKIEVYCH, GEORGE | United States | 512-471-5904 | | george.yatskievych@austin.utexas.edu | Systematics of pteridophytes & parasitic plants; floristics, especially Southwestern and Midwestern USA & Mexico; plant conservation; herbarium management. | View |
| ZIMMERMAN, ALLAN D. | United States | | | | Systematics of Cactaceae. | View |