| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| Gill, Ash | United States | 9712636039 | | ashrose.gill@gmail.com | Systematics, Phylogeography, Mycoheterotrophy, Coevolution, Parasitism | View |
| GILMAN, ARTHUR V. | United States | | | avgilman@together.net | Pteridophytes; Rosa; Floristics of Northeastern North America | View |
| Gilman, Ian | United States | | | gilmania@msu.edu | Phylogenetics, photosynthesis, Portulaca, CAM, C4 | View |
| Girard, Stephan | United States | | | stephangirard2024@u.northwestern.edu | | View |
| Givnish, Thomas | United States | 608-293-2330 | | givnish@wisc.edu | Molecular systematics and the analysis of adaptive radiations; commelinoid and lilioid monocots (especially Bromeliaceae, Rapateaceae, Liliaceae s.l.) and Lobeliaceae (especially Pacific Basin taxa) / Plan ecology, evolution, biogeography, and physiological and biomechanical adaptations | View |
| GLENNON, JAMES | United States | 13073891118 | | wybtny@live.com | Floristics. | View |
| Goodrich, Garrett | United States | 9092858243 | | garrettpgoodrich@gmail.com | | View |
| Gostel, Morgan | United States | 817-463-4199 | | mgostel@brit.org | Asteraceae, Burseraceae, Commiphora, Plant molecular systematics, Phylogenomics, Biogeography, Madagascar | View |
| GRAHAM, SHIRLEY A. | United States | | | shirley.graham@mobot.org | Systematics of Lythraceae. | View |
| Graves, Skylar | United States | 7203638043 | | skly5321@colorado.edu | | View |
| Groh, Jeffrey | United States | | | jgroh@ucdavis.edu | evolution, genetics, mating systems, hybridization | View |
| GUILLIAMS, C. MATT | United States | 619-857-0145 | | mguilliams@sbbotanicgarden.org | Plagiobothrys & other Amsinckiinae (Boraginaceae); Calyptridium, Cistanthe, Lewisia, & Lewisiopsis (Montiaceae); Ribes (Grossulariaceae); Marah (Cucurbitaceae); evolution, ecology, & conservation of vernal pool ecosystems; American amphitropical biogeography. | View |
| GUNNER, SIMON | United States | 9784603060 | | stg35@cornell.edu | Nomenclature, Plant Ecology, Plant Conservation | View |
| HABERLE, ROSEMARIE (Romey) C. | United States | 253-535-7199 | | haberlrc@plu.edu | Campanulaceae; Biogeography, PNW floristics, Invasive plants. | View |
| Hahn, Marlene | United States | 6307252114 | | mhahn@mortonarb.org | | View |
| HALSE, RICHARD R. | United States | 541-753-2037 | | halser@science.oregonstate.edu | Taxonomy of the Hydrophyllaceae. | View |
| Handley, Joy | United States | 3077666652 | | jch_tigger@yahoo.com | Rare plants, Community ecology, Biogeography, Pollination | View |
| HANES, MARGARET | United States | 734-487-4394 | | mkoopma2@emich.edu | Madagascar; Malvaceae; Hibiscus | View |
| HANSEN, CURTIS J. | United States | 344-844-1630 | | hansecj@auburn.edu | Herbarium management; plant systematics; floristics; lichens. | View |
| HARDIG, T. MIKE | United States | 205-665-6463 | 205-665-6477 | hardigm@montevallo.edu | | View |
| HARDY, CHRISTOPHER | United States | 717-871-2312 | 717-872-3905 | christopher.hardy@millersville.edu | Monocot systematics; biodiversity informatics. | View |
| HARRIS, RICHARD C. | United States | 718-817-8624 | 718-817-8648 | rharris@nybg.org | Lichens. | View |
| Hartung, Eli | United States | 7244875356 | | elishartung@gmail.com | Poaceae, Papaveraceae, Edaphic Endemism | View |
| Hastings, Cara | United States | 8285454064 | | carahastings@boisestate.edu | Phylogenomics and biogeography | View |
| Hastings, Nancy | United States | 19702372359 | | nancy.hastings@colostate.edu | Floristic surveys on military lands | View |
| HAUFLER, CHRISTOPHER | United States | | | vulgare@ku.edu | Biosystematics, speciation, population biology, polyploidy, pteridology, & evolutionary mechanisms of ferns (Pteridophyta), Polypodiaceae, Polypodium. | View |
| HAUK, WARREN | United States | 740-587-5758 | | hauk@denison.edu | Ophioglossaceae systematics | View |
| HELLENTHAL, BARBARA J. | United States | 574-631-6684 | | barbara.j.hellenthal.2@nd.edu | | View |
| HERENDEEN, DONNA | United States | 301-335-9387 | | deherendeen@gmail.com | | View |
| HERENDEEN, PATRICK S. | United States | 847-835-6956 | | pherendeen@chicagobotanic.org | Leguminosae, paleobotany | View |
| HERMSEN, ELIZABETH J. | United States | 607-273-6623 | | ejhermsen@gmail.com | Paleobotany; plant systematics. | View |
| HIGGINS, WESLEY E. | United States | 239-542-3857 | | wesley.higgins@comcast.net | Systematics of Laeliinae (Orchidaceae). | View |
| HILL, STEVEN R. | United States | 217-359-8432 | | srhill50@msn.com | Systematics of Malvaceae; flora of Dominica, Lesser Antilles; floristics of eastern U.S.A.; herbarium curation. | View |
| HOCH, PETER C. | United States | 314-577-5175 | | phoch@mobot.org | Onagraceae, Epilobium, phenology, pollination biology | View |
| HODGSON, WENDY | United States | 480-481-8108 | | whodgson@dbg.org | Agavaceae; floristics & ethnobotany of southwestern U.S. & northern Mexico. | View |
| Holmgren, Noel H. | United States | 435 770 3374 | | noelholmgren52@gmail.com | Penstemon (Scrophulariaceae); flora of the Intermountain West, USA | View |
| Holmgren, Patricia | United States | 435 770 3374 | | clhpat1940@gmail.com | Floristics of western United States. | View |
| Holsinger, Kent | United States | 860-486-0983 | | kent.holsinger@uconn.edu | Theoretical & experimental aspects of plant population biology; systematics of Clarkia (Onagraceae). | View |
| HOLST, BRUCE K | United States | 941-217-8132 | | bholst@selby.org | Systematics of Bromeliaceae, Myrtaceae; floristics of Belize, Venezuela, Guayana Shield, Florida. | View |
| HOOT, SARA B. | United States | 414-229-2654 | | hoot@uwm.edu | Ranunculales; Ranunculaceae; Menispermaceae; Anemone; molecular systematics. | View |
| HORN, CHARLES N. | United States | 803-321-5257 | | charles.horn@newberry.edu | Pontederiaceae; Rhododendron | View |
| Houston, Ezra | United States | 814-880-5495 | | eph5151@psu.edu | | View |
| HOWARTH, DIANELLA | United States | 718-990-1679 | | howarthd@stjohns.edu | Floral evo-devo and evolution of Hawaiian plants. | View |
| Hubbard, Sierra | United States | | | sierra.hubbard@okstate.edu | | View |
| HUFT, MICHAEL J. | United States | 219-286-3396 | 219-286-3396 | mhuft@att.net | Euphorbiaceae; Great Lakes Flora. | View |
| Hunter, Sarah | United States | | | sarahgrace13@utexas.edu | | View |
| ICKERT-BOND, STEFANIE M. | United States | 907-474-6277 | | smickertbond@alaska.edu | Molecular systematics, phylogeny, biogeography, & morphological evolution; comparative morphology and anatomy; integration of fossil data to biogeography, speciation & character evolution; revisionary work; Altingiaceae, Ephedra, Vitaceae, Oxytropis, | View |
| ISLAM, MELISSA | United States | | | melissa.islam@gmail.com | Rhamnaceae; Erythroxylaceae. | View |
| JANEWAY, LAWRENCE | United States | 530-898-5381 | | ljaneway@csuchico.edu | Carex (Cyperaceae); northern California floristics; herbarium curator (CHSC). | View |
| JANSEN, ROBERT K. | United States | 5124718827 | | jansen@austin.utexas.edu | Organization and evolution of plastid genomes; computational methods for comparative genomics; coordinated evolution between mitochondrial, nuclear and plastid genomes; and systematics and the evolution of the Geraniaceae and Fabaceae | View |