| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| ROQUE, NADIA | Brazil | 557132836530 | | nadiaroque@gmail.com | Asteraceae; taxonomy; floristics; phylogenetic systematics. | View |
| ROTHWELL, GAR W. | United States | 541 737-5252 | | rothwell@ohio.edu | Plant structure and development, Paleobotany, Land plant phylogeny. | View |
| RUA, GABRIEL HUGO | Argentina | +54-11-52870173 | | ruagabri@agro.uba.ar | Systematics of Poaceae; inflorescence morphology. | View |
| Saavedra Sáenz, Carolina | Brazil | +5561996768845 | | ycsaavedras@unal.edu.co | | View |
| SAKAI, ANN K. | United States | | 949 824 2181 | aksakai@uci.edu | Plant breeding systems, conservation biology, evolutionary ecology, systematics of Schiedea (Caryophyllaceae) | View |
| SANTOS, MALIA | United States | 8088955485 | | msantos2@uwyo.edu | | View |
| Savage, Rachel | United States | 6512455691 | | rlsavage@uark.edu | | View |
| SCHARASCHKIN, TANYA | Australia | +61-3-62000543 | | t.scharaschkin@qut.edu.au | systematics, plant structure, Poaceae, Annonaceae | View |
| SCHENK, JOHN J. | United States | (912) 478-0848 | | schenk@ohio.edu | Phylogenetics of Paronychia (Caryophyllaceae), Podostemaceae, and Mentzelia (Loasaceae); Macroevolution, Floral Evolution | View |
| SCHILLING, EDWARD E. | United States | 865-974-3065 | | eschilling@utk.edu | Asteraceae, subtribe Helianthinae, tribes Cichorieae and Eupatorieae; Trillium; rare plants of southeastern U.S.A. | View |
| SCHORI, MELANIE | United States | 740-274-2643 | | ms335704@ohio.edu | Stemonuraceae; Cardiopteridaceae; Aquifoliales reproductive anatomy; embryology; palynology; floristics; nomenclature. | View |
| Sekarathil, Resmi | India | 7034773486 | | resmi.sonerila@gmail.com | Plant systematics, taxonomy, molecular phylogeny and biogeography of Indian Melastomataceae | View |
| Shamsid-Deen, Maya | United States | 5056043797 | | | Systematics of Glossopetalon, phenotypic plasticity, plant colonization, plant biology | View |
| SHAW, JOEY | United States | 423-425-4265 | 423-425-2285 | joey-shaw@utc.edu | Molecular systematics; Prunus; Rosaceae; floristics; invasive foreign species. | View |
| Silva da Silva Filho, Pedro Joel | Brazil | +5551999890523 | | pedro.filho@ufsm.br | | View |
| Simachai, Supakan | Thailand | +66863772215 | | supakan.sim@student.mahidol.edu | Plant systematics, Plant taxonomy, Evolutions, Phylogenetics, Molecular genetics | View |
| SIMPSON, BERYL B. | United States | | | | Evolutionary biology; plant systematics; biogeography. | View |
| SMITH, ALAN R. | United States | 510-643-1000 | 510-643-5390 | arsmith@berkeley.edu | Systematics of pteridophytes, especially Thelypteris. | View |
| SMITH, JAMES F. | United States | 208-426-3551 | | jfsmith@boisestate.edu | Gesneriaceae, Piperaceae, Western North American Apiaceae | View |
| SNOW, NEIL | United States | 6202354424 | | nsnow@pittstate.edu | Myrtaceae; Poaceae; floristics; herbarium curation | View |
| SOSA, VICTORIA | Mexico | +52-228-8421874 | | victoria.sosa@inecol.mx | Orchidaceae; endemic genera of Mexico; molecular systematics; spatial phylogenetics, Flora of Mexico online | View |
| Spalink, Daniel | United States | 6085159129 | 608-262-4422 | dspalink@exchange.tamu.edu | Systematics. | View |
| STAAHL, BERTIL | Sweden | +46-498-108358 | | bertil.staahl@ebc.uu.se | Theophrastaceae; Andean Symplocaceae; legumes of Ecuador; Flora of Ecuador. | View |
| STAPF, MARIA | Panama | +507-6779-9616 | | mnstapf@yahoo.com | Phylogeny & taxonomy of Cordia (Boraginaceae). | View |
| STAPLES, GEORGE | United States | | | geozsg@gmail.com | Convolvulaceae; taxonomy of cultivated plants; nomenclature. | View |
| STEHMANN, JOAO | Brazil | +55-31-34092670 | | stehmann@ufmg.br | Plant systematics; taxonomy; Solanaceae; Atlantic Forest. | 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 |
| STROTHER, JOHN L. | United States | 510-642-7890 | | strother@berkeley.edu | Compositae. | View |
| SYTSMA, KENNETH J. | United States | 608-262-4490; 608-262-4422 | | kjsytsma@wisc.edu | Phylogenetics of Myrtales, Onagraceae, Bromeliaceae, Lamiaceae; Biogeography | View |
| Tageant, Rachel | United States | 360-591-8898 | | rtageant@rsabg.org | | View |
| Tamayo, Maverick | United States | 6827169814 | | m.n.tamayo@tcu.edu | Vaccinium (Ericaceae) | 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 |
| 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, Nathan | United States | | | | Taxonomy, Euphorbia sect. Anisophyllum, High Plains of Texas Flora | View |
| Tucker, Daniel | Canada | 780-934-0629 | | dbltucker@uvic.ca | | View |
| TURNER, BILLIE L. | United States | 915-837-0016 | 915-837-0016 | billie@uts.cc.utexas.edu | Systematics. | View |
| URBATSCH, LOWELL | United States | 225-921-1614 | | leu@lsu.edu | Asteraceae; molecular systematics; central Gulf of Mexico flora | View |
| VALDESPINO Q., IVAN | Panama | +507-321-0918 | | iavaldespino@gmail.com | Neotropical ferns and lycophytes; Selaginella (Selaginellaceae); biodiversity conservation. | View |
| Vanrooyen, Dilrini | United States | | | vanrooyen@wisc.edu | Botany | View |
| Vargas, Lucia | United States | 6823900298 | | l.l.vargaslongas@tcu.edu | | View |
| VASCO, ALEJANDRA | United States | 8177730803 | | avascog@gmail.com | Fern Taxonomy and Systematics | View |
| Vasconcelos, Caroline da Cruz | Brazil | 55 92 982234291 | | cc_vasconcelos@hotmail.com | Sapotaceae; Systematics; Taxonomy, Plant Ecology; Amazonian flora | View |
| Vega, Andrea Susana | Argentina | 011 4524 8000 | | | Botany, Poaceae, Anatomy, Morphology. | View |
| Vengco, Selena | United States | 5106764963 | | svengco@calbg.org | Population genetics; molecular systematics; mechanisms of evolution. | View |
| Waselkov, Katherine | United States | 251-802-5802 | | kwaselkov@csufresno.edu | plant systematics, Amaranthaceae, population genetics, agricultural weeds | View |
| WATSON, LINDA | United States | 405-744-5559 | | linda.watson10@okstate.edu | Asteraceae, Compositae, molecular systematics, phylogenomics | View |
| WAYCOTT, MICHELLE | Australia | +61-8-8222-9416 | +61-8-8222-9457 | michelle.waycott@adelaide.edu.au | Plant systematics; evolution; taxonomy of marine angiosperms; population genetics; Australian flora. | View |
| Wei, Yushin | United States | 8504456274 | | ywei77@wisc.edu | | View |
| WELLER, STEPHEN G. | United States | 949-824-6581 | 949-824-2181 | sgweller@uci.edu | Reproductive biology. | View |
| WENDT, THOMAS L. | United States | 512-471-5904 | | twendt@austin.utexas.edu | Tropical trees of Mexico; Polygalaceae. | View |