| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| 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 |
| SMITH, ALAN R. | United States | 510-643-1000 | 510-643-5390 | arsmith@berkeley.edu | Systematics of pteridophytes, especially Thelypteris. | View |
| Skogen, Krissa | United States | 18608334922 | | kskogen@clemson.edu | evolutionary ecology, plant reproduction, pollination biology, population biology, population genetics, Onagraceae, moth pollination | View |
| SKOG, LAURENCE E. | United States | 202-633-0913 | | skogl@si.edu | Gesneriaceae of the neotropics. | View |
| Skinner, David | United States | 8504457382 | | | Costaceae | View |
| Skibicki, Sam | United States | | | svs0008@mix.wvu.edu | Asteraceae; Heliantheae; Zinniinae | View |
| SKEMA, CYNTHIA | United States | | | cks28@cornell.edu | Systematics of dombeyoids and Malvaceae, floral development & gender expression, flora of Madagascar, flora of Pennsylvania, digitization of herbarium collections | View |
| Siniscalchi, Carolina | United States | | | | | View |
| SIMPSON, MICHAEL G. | United States | 619-594-8012 | | msimpson@sdsu.edu | Systematics, monocots, pollen ultrastructure; Haemodoraceae; Boraginaceae; Lamiaceae. | View |
| SIMPSON, BERYL B. | United States | | | | Evolutionary biology; plant systematics; biogeography. | View |
| SIMMONS, MARK P. | United States | 970-491-2154 | | psimmons@rams.colostate.edu | Celastraceae. | View |
| Shultz, Leila | United States | 435-232-2989 | | l.shultz@usu.edu | botanical systematics | View |
| SHAW, JOEY | United States | 423-425-4265 | 423-425-2285 | joey-shaw@utc.edu | Molecular systematics; Prunus; Rosaceae; floristics; invasive foreign species. | View |
| Sharples, Mathew | United States | 970-531-8188 | | | Plant Systematics, Floristics, Biogeography | View |
| Shamsid-Deen, Maya | United States | 5056043797 | | | Systematics of Glossopetalon, phenotypic plasticity, plant colonization, plant biology | View |
| Serrano, Caila | United States | 5714240158 | | cailahs@vt.edu | | View |
| Seigler, David | United States | 217-778-1496 | | daveseig@illinois.edu | Plant systematics, phytochemistry, mimosoid legumes | View |
| Scott, Randy | United States | | 928-523-7500 | randall.scott@nau.edu | | View |
| Schuettpelz, Eric | United States | 202-633-0914 | 2026330914 | schuettpelze@si.edu | Fern systematics | View |
| SCHORI, MELANIE | United States | 740-274-2643 | | ms335704@ohio.edu | Stemonuraceae; Cardiopteridaceae; Aquifoliales reproductive anatomy; embryology; palynology; floristics; nomenclature. | View |
| SCHNEIDER, ADAM | United States | | | acschneider@berkeley.edu | Parasitic plant ecology and systematics, specifically Aphyllon (Orobanchaceae); Arceuthobium (Viscaceae); Cuscuta (Convolvulaceae); serpentine soils | View |
| Schmidt, Ryan | United States | 9732942042 | | ryanschmidt1399@gmail.com | Historical Botany, Systematics, Herbaria, Invasion Biology | View |
| SCHMIDT JABAILY, RACHEL | United States | | | jabailyr@gmail.com | plant systematics; phylogenetic inference; life history; Goodeniaceae; Bromeliaceae | 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 |
| SCHENK, JOHN J. | United States | (912) 478-0848 | | schenk@ohio.edu | Phylogenetics of Paronychia (Caryophyllaceae), Podostemaceae, and Mentzelia (Loasaceae); Macroevolution, Floral Evolution | View |
| Savage, Rachel | United States | 6512455691 | | rlsavage@uark.edu | | View |
| SANTOS, MALIA | United States | 8088955485 | | msantos2@uwyo.edu | | View |
| Salywon, Andrew | United States | 602-481-8107 | | asalywon@dbg.org | Cactaceae, Myrtaceae, & Agavaceae. | View |
| SAKAI, ANN K. | United States | | 949 824 2181 | aksakai@uci.edu | Plant breeding systems, conservation biology, evolutionary ecology, systematics of Schiedea (Caryophyllaceae) | View |
| RUHFEL, BRAD | United States | 734-615-6404 | | ruhfel@umich.edu | Phylogenetics; green plants; clusioids; Podostemaceae | View |
| ROTHWELL, GAR W. | United States | 541 737-5252 | | rothwell@ohio.edu | Plant structure and development, Paleobotany, Land plant phylogeny. | View |
| ROTHFELS, CARL | United States | | | carl.rothfels@usu.edu | phylogenetics, ferns, lycophytes, polyploidy, reticulate evolution | View |
| Roman, Maria | United States | 3057098294 | | mromanayo@gmail.com | | View |
| Rohrer, Joseph | United States | 715-835-0560 | | jrohrer@uwec.edu | | View |
| RODMAN, JAMES E. | United States | 360-307-7033 | | rodman69_890@msn.com | Brassicaceae; chemosystematics; phylogenetics; plant-insect co-evolution. | View |
| ROBINSON, HAROLD E. | United States | 202-633-0955 | 202-786-2563 | robinsoh@si.edu | Bryology; Asteraceae. | View |
| ROALSON, ERIC H. | United States | 509-335-7921 | | eric_roalson@wsu.edu | Cyperaceae; Gesneriaceae; Cleomaceae; C4 evolution. | View |
| RIGGINS, RHONDA | United States | 805-544-6595 | | rhorigg@charter.net | Lupinus (Fabaceae). | View |
| RIGGINS, CHANCE W. | United States | 217-300-0563 | | cwriggin@illinois.edu | Artemisia (Asteraceae); Amaranthus (Amaranthaceae); Acacia (Fabaceae); Crop Evolution; Crop Wild Relatives; Phytochemistry | View |
| REZNICEK, ANTON (TONY) A. | United States | 734-764-5544; 734-996-0692 | | reznicek@umich.edu | Systematics of Cyperaceae; Floristics, Biogeography, and Botanical History of the Great Lakes Region | View |
| Rea, Edison | United States | 7068888002 | | edisonjavier.rea@gmail.com | Systematic of Tropical Forest | View |
| Raynor, Seth | United States | | | seth.raynor@colorado.edu | Lichens, Plants, Taxonomy, Biogeography, Natural History | View |
| RAVEN, PETER H. | United States | 314-577-9577 | 314-577-9596 | peter.raven@mobot.org | Plant geography; Onagraceae. | View |
| RANKER, TOM A. | United States | 808-489-2832 | | tom.ranker@gmail.com | Systematics, Island Biogeography and Biodiversity, Floristics, Ferns & Lycophytes | View |
| RANDLE, CHRISTOPHER P. | United States | 936-294-1554 | | randle@shsu.edu | Molecular phylogenetics; Harveya; Orobanchaceae. | View |
| Ramm, Zacc | United States | 2516561033 | | ztr1921@jagmail.southalabama.edu | | View |
| QIU, YIN-LONG | United States | 7347648279 | | ylqiu@umich.edu | Basal angiosperm phylogeny & land plant phylogeny; mitochondrial genome evolution. | View |