| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| Vanrooyen, Dilrini | United States | | | vanrooyen@wisc.edu | Botany | View |
| URBATSCH, LOWELL | United States | 225-921-1614 | | leu@lsu.edu | Asteraceae; molecular systematics; central Gulf of Mexico flora | View |
| ULLOA ULLOA, CARMEN | United States | 314-577-5168 | | carmen.ulloa@mobot.org | Neotropical Berberidaceae, Andean Melastomataceae; flora of Ecuador; Andean flora | View |
| Tyrrell, Christopher | United States | | | tyrrell@mpm.edu | bamboos, aquatic macrophytes, Bambusoideae, informatics, taxonomy, systematics, biogeography | View |
| TURNER, BILLIE L. | United States | 915-837-0016 | 915-837-0016 | billie@uts.cc.utexas.edu | Systematics. | View |
| TRIPP, ERIN A. | United States | 3034921862 | 303-492-1862 | erin.tripp@colorado.edu | plant and lichen biodiversity | View |
| TORKE, BENJAMIN M. | United States | | | btorke@nybg.org | Systematics of legumes; tropical plant species diversity | View |
| Tobin, Trinity | United States | | | trinity.tobin@cortland.edu | | View |
| TIPPERY, NICHOLAS | United States | 262-472-1061 | | nicholas.tippery@gmail.com | Aquatic plants; Menyanthaceae. | View |
| TIEHM, ARNOLD | United States | 775-742-9180 | | atiehm@att.net | Great Basin flora; botanical history of the Western United States. | View |
| Thummel, Ryan | United States | | | ryanthummel@comcast.net | | View |
| Thiers, Barbara | United States | 9144159977 | | bthiers@nybg.org | Bryophytes; biodiversity informatics; collections management. | View |
| TEPE, ERIC J. | United States | 513-376-5539 | | eric.tepe@uc.edu | Systematics of Piper (Piperaceae) & Solanum (Solanaceae); evolution of ant-plant associations. | View |
| TAYLOR, W. CARL | United States | 703 474 8702 | | wcarl.taylor@gmail.com | Phylogeny & taxonomy of Isoetaceae. | View |
| Taylor, Nathan | United States | | | | Taxonomy, Euphorbia sect. Anisophyllum, High Plains of Texas Flora | View |
| TAYLOR, DAVID WILLIAM | United States | 503-943-8513 | | taylorda@up.edu | Systematics and reproductive biology of the Malpighiaceae and Rubiaceae; Chione; Colleteria; Wandersong; Stigmaphyllon; economic botany; ethnobotany. | View |
| TAYLOR, CHARLOTTE M. | United States | 314-577-9436 | 314-577-0830 | charlotte.taylor@mobot.org | Taxonomy, floristics, and systematics of Neotropical Rubiaceae. | View |
| TANK, DAVID | United States | 307-766-4276 | | dtank@uwyo.edu | Systematics of Castilleja & subtribe Castillejinae (Orobanchaceae); allopolyploidy; molecular systematics of Asteridae with an emphasis on Campanulidae, Lamiales, & Orbanchaceae. | View |
| Tamlyn, Catherine | United States | | | catherinetamlyn@gmail.com | Phylogenetics, convergent morphology, divergent morphology, riparian biodiversity, riparian evolution | View |
| Tamayo, Maverick | United States | 6827169814 | | m.n.tamayo@tcu.edu | Vaccinium (Ericaceae) | View |
| Talavera, Alicia | United States | | | talaveraa@si.edu | Systematics, biodiversity, evolution, and agriculture. | View |
| Tageant, Rachel | United States | 360-591-8898 | | rtageant@rsabg.org | | View |
| SYTSMA, KENNETH J. | United States | 608-262-4490; 608-262-4422 | | kjsytsma@wisc.edu | Phylogenetics of Myrtales, Onagraceae, Bromeliaceae, Lamiaceae; Biogeography | View |
| SWEENEY, PATRICK | United States | 203-432-3537 | | patrick.sweeney@yale.edu | Systematics & evolution of Clusiaceae (esp. Garcinia) and Viburnum (Adoxaceae), biodiversity informatics, North American florisitics | View |
| SVOBODA, HARLAN | United States | 2022452715 | | htsvoboda@gmail.com | Systematics; taxonomy; phylogenetics; nomenclature; Passiflora; morphology | View |
| Stull, Gregory | United States | 6144062119 | | gwstull@gmail.com | Angiosperm phylogeny, paleobotany, fruit and seed morphology, flora of Mesoamerica, flora of Southeast Asia | View |
| STUESSY, TOD F. | United States | 614-292-3296 | | stuessy.1@osu.edu | Asteraceae; island biology; flora of Chile. | View |
| STRUWE, LENA | United States | 848-932-6343 | | lena.struwe@rutgers.edu | Gentianaceae; tropical biogeography; Loganiaceae; Gelsemiaceae; molecular systematics; urban botany; weeds; botanical education; | View |
| STROTHER, JOHN L. | United States | 510-642-7890 | | strother@berkeley.edu | Compositae. | View |
| STRAUB, SHANNON | United States | 315-781-3713 | | straub@hws.edu | Asclepias; Apocynaceae; Amorpha; Fabaceae | View |
| STRATTON, JENNY | United States | 217-344-4615 | | jenny.marie.stratton@gmail.com | | View |
| STONEBURNER, ANN | United States | 706-769-5362 | | ahstoneburner@bellsouth.net | Moss systematics. | View |
| STOCKEY, RUTH | United States | 541-220-8752 | | ruth.stockey@ualberta.ca | Paleobotany: conifers, monocots, ferns, angiosperms (Lauraceae, Araceae, Lythraceae, Rosaceae, Saururaceae, Vitaceae, Arecaceae, Alismataceae). | View |
| Stiles, Elena | United States | 8144412750 | | estiles@uw.edu | Paleobotany, Paleoecology, Poaceae Evolution | View |
| Stickrod, Morgan | United States | 415-640-2654 | | stickrod.morgan@gmail.com | Plant ecology, systematics, botany | View |
| STEVENS, PETER F. | United States | 314-577-0861 | | peter.stevens@mobot.org | History & theory of systematics; Clusiaceae; Ericaceae; flowering plant phylogeny. | View |
| STERN, STEPHEN | United States | 801-870-6891 | 801-870-6891 | sstern@coloradomesa.edu | Tropical botany; Solanum. | View |
| STAPLES, GEORGE | United States | | | geozsg@gmail.com | Convolvulaceae; taxonomy of cultivated plants; nomenclature. | View |
| Spencer, Audrey | United States | 8608845506 | | audrey.spencer@ucdenver.edu | Systematics, floristics, taxonomy, biogeography | View |
| SPECHT, CHELSEA D. | United States | (607) 255-9293 | | cdspecht@cornell.edu | Systematics & floral evolution in Costaceae; Zingiberales; monocot phylogenetics; molecular evolution; morphology with emphasis on monocots & Zingiberales. | View |
| Spalink, Daniel | United States | 6085159129 | 608-262-4422 | dspalink@exchange.tamu.edu | Systematics. | View |
| Spagnuolo, Edward | United States | 6316557235 | | spagnuolo@psu.edu | Paleobotany, fossils, systematics, legumes, biogeography, Malesia | View |
| SØRENSEN, PAUL D. | United States | 815-753-7848 | 815-753-0461 | psorensen@niu.edu | Systematics of Dahlia (Asteraceae) & Arbutus (Ericaceae); floristics of upper midwestern United States; wetlands ecology; biology of Dodecatheon (Primulaceae). | View |
| SORENG, ROBERT J. | United States | 202-633-0981 | | sorengr@si.edu | Poaceae, Pooideae, & Poa; 2009 Catalogue of New World Grasses (Poaceae) project web site: <http://mobot.mobot.org/W3T/Search/nwgc.html>. | View |
| SOLTIS, PAMELA S. | United States | 3522731964 | 3528462154 | psoltis@flmnh.ufl.edu | Angiosperm phylogeny; polyploidy; floral genetics & evolution; conservation genetics. | View |
| SOLTIS, DOUGLAS E. | United States | | | dsoltis@botany.ufl.edu | Angiosperm biosystematics; polyploidy; molecular systematics. | View |
| SNOW, NEIL | United States | 6202354424 | | nsnow@pittstate.edu | Myrtaceae; Poaceae; floristics; herbarium curation | View |
| SMITH, STACEY D. | United States | 303-492-1374 | 303-492-1374 | stacey.d.smith@colorado.edu | Systematics of Solanaceae; comparative analysis; pollination biology. | View |
| SMITH, JAMES P. | United States | | | jps2@humboldt.edu | Flora of northwest California; Gramineae. | View |
| SMITH, JAMES F. | United States | 208-426-3551 | | jfsmith@boisestate.edu | Gesneriaceae, Piperaceae, Western North American Apiaceae | View |