| Name | Country (Main) | Phone and Extension-Phone (Main) | Phone and Extension-Fax (Main) | Email (Main) | Research Interests | |
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| Powell, Mike | United States | | | ampowell@sulross.edu | | View |
| POWELL, A. MICHAEL | United States | 432-837-8366 | | powell@bigbend.net | Systematics; flora of northern Chihuahuan Desert region. | View |
| POTTER, DANIEL | United States | 530-754-6141 | | dpotter@ucdavis.edu | | View |
| Poston, Muriel | United States | 3012575911 | | muriel_poston@pitzer.edu | Systematics of Loasaceae; floristics; undergraduate education. | View |
| Poindexter, Emily | United States | | | emily.b.poindexter@gmail.com | Plant systematics, conservation, herbaria, natural history collections | View |
| PLUNKETT, GREGORY M. | United States | 718-817-8179 | | gplunkett@nybg.org | Taxonomy and molecular systematics of Apiaceae; Araliaceae; Pittosporaceae; Pacific floristics and biogeography. | View |
| Plume, Olofron | | | | op32@cornell.edu | plant systematics, evolution of polyploidy and chemistry in plants | View |
| Pizzardo, Raquel | United States | 7542157340 | | raquel.pizzardo@gmail.com | Systematics, phylogenetics, Neotropics | View |
| Pirie, Michael | Norway | +4745862644 | | mike.pirie@gmail.com | Systematics & evolution of flowering plants; Erica; Annonaceae | View |
| PIRES, J. CHRIS | United States | | | chris.pires@colostate.edu | Polyploidy, chromosomal evolution, & phylogenetics of Brassica & petaloid monocots; Brassicaceae; Asparagaceae; Alliaceae | View |
| PINZL, ANN | United States | 775-883-0463 | | apinzl@sbcglobal.net | Collections; Nevada flora. | View |
| Pinto, Esteban | United States | 7062892503 | | estebanpinto1284@gmail.com | Plant systematics, plant ecology, plant phylogenies, forest dynamics, carbon dynamics | View |
| PIMENTEL PEREIRA, MANUEL | Spain | +34-981167000 Ext.2238 | | mpimentel@udc.es | Taxonomy; morphology; phylogeny, phylogeography; Poaceae; Mosses, Ferns | View |
| Phipps, Julie | | | | juliannephipps2023@u.northwestern.edu | | View |
| Petzke, Alex | United States | | | apetzke89@gmail.com | Phylogeography, historical biogeography, population genetics, taxonomy, systematics | View |
| PETERSON, PAUL M. | United States | 202-633-0975 | | peterson@si.edu | Poaceae | View |
| Pérez Zabala, Jorge Andrés | Colombia | 6044309348 | | japzmedel@gmail.com | Neotropical floristics; Rosaceae; Prunus; Rutaceae; Biogeography; Plant Ecology. | View |
| Perez Perez, Miguel | United States | 484 343 6604 | | map758@nau.edu | | View |
| PENNEYS, DARIN | United States | 910.962.3046 | | dpenneys@yahoo.com | Phylogenetics of the Melastomataceae. SE USA flora. Philippines flora. | View |
| PELSER, PIETER B. | New Zealand | +64-(3)-3695228 | | pieter.pelser@canterbury.ac.nz | | View |
| Pell, Susan | United States | 2025588058 | | susankpell@gmail.com | Systematics of Anacardiaceae and Sapindales, informal botanical education | View |
| PEDERNEIRAS, LEANDRO | Brazil | 5521 998228371 | | leandro.pederneiras@gmail.com | Taxonomy, Systematic and Phylogeny | View |
| PATTERSON, THOMAS | United States | (512) 305 3513 | | thfpatterson@gmail.com | Pinaceae; Eupatorieae; flora of South Texas. | View |
| PATTERSON, ROBERT W. | United States | 415-699-6599 | | patters47@gmail.com | Systematics of Polemoniaceae, Hydrophyllaceae, and Namaceae; California floristics. | View |
| Pastore, Mayara | Brazil | +55 91 981092265 | | pastoremay@gmail.com | | View |
| PARIS, CATHERINE A. | United States | 802-656-2930 | 802-656-0440 | cparis@uvm.edu | Systematics & evolution of ferns & other vascular plants; plant geography. | View |
| Paredes-Burneo, Diego | United States | 1-225-578-8555 | | diegop.francob@gmail.com | Evolution and biogeography of high Andean members of Melastomataceae, especially Brachyotum. | View |
| Pantinople, Dexcem | United States | | | dexcempantinople@gmail.com | | View |
| PAK, JAE-HONG | Korea, Republic of | +82-53-950-5352 | +82-53-953-3066 | jhpak@knu.ac.kr | Taxonomy & phylogeny of Lactuceae, Asteraceae. | View |
| PAGANUCCI DE QUEIROZ, LUCIANO | Brazil | +55-7532248021 | +55-7532248033 | luciano.paganucci@gmail.com | Leguminosae systematics & biogeography. | View |
| Padin, Ariana | Argentina | | | arianapadin@comahue-conicet.gob.ar | Systematic, phylogenetic and biogeography of plants. | View |
| Pacifico, Ricardo | Brazil | 44998634659 | | ricardo_b9@hotmail.com | Melastomataceae. | View |
| PACE, MATTHEW | United States | 631-664-6693 | | mpace@nybg.org | Orchidaceae; taxonomy; systematics; phylogenetics; Herbaria | View |
| Oso, Oluwatobi | United States | 2039801497 | | osooluwatobia@gmail.com | Plant Anatomy, Development, Evolution, and Systematics. | View |
| Osborne, Jonathon | United States | 16016639490 | | jonathon.osborne@usm.edu | | View |
| ORTIZ, SANTIAGO | Spain | +34-81-563100 Ext.14976 | | santiago.ortiz@usc.es | Taxonomy of tropical African Asteraceae. | View |
| Ortiz, Orlando | Germany | | | ortizopma@gmail.com | Plant Taxonomy, Herbarium, Biodiversity, Plant Systematics, Floristic Studies, Phylogenetic Analysis, Nomenclature, Ecology and Evolution, Conservation Biology | View |
| Ortiz-Gentry, Rosa | United States | 314-577-5171 | | rosa.ortiz-gentry@mobot.org | Systematics of Menispermaceae. | View |
| ORTIZ DIAZ, JUAN JAVIER | Mexico | +52-999-9423200 | | odiaz@uady.mx | Systematics: Poaceae (Chloridoideae, Panicoideae), Polygonaceae (Coccoloba, Gymnopodium, Neomillspaughia, Podopterus) of Middle America. Floristics of Yucatan Peninsula savannas | View |
| ORLOVICH, DAVID ALLAN | New Zealand | +64-3-479-9060 | | david.orlovich@otago.ac.nz | Floral biology; molecular phylogenetics; Myrtaceae; Poaceae. | View |
| Orlandini, Priscila | Brazil | (+55) 19-996312270 | | priscilaorlandini@gmail.com | Taxonomy, Phyllanthaceae, Euphorbiaceae, Malpighiales | View |
| OLMSTEAD, RICHARD G. | United States | 206-543-8850 | | olmstead@u.washington.edu | Systematics of Scutellaria (Lamiaceae); molecular systematics of Boraginales, Lamiales, Solanales & other Asteridae; Angiosperm phylogeny. Neotropical biodiversity. | View |
| OHI-TOMA, TETSUO | Japan | | | ooitoma@ous.ac.jp | | View |
| OHBA, HIDEAKI | Japan | | +81-3-5841-8456 | ohba@um.u-tokyo.ac.jp | | View |
| OH, SANG-HUN | Korea, Republic of | +82-042-280-2434 | | soh42@dju.kr | Molecular systematics; Rosaceae; Crossosomatales; Orchidaceae. | View |
| Odufuwa, Phebian | United States | 2086004889 | | phebianodufuwa@boisestate.edu | Phylogenomics, biogeography, machine learning, species delimitation, botany, molecular evolution and systematics | View |
| OCHOTERENA, HELGA | Mexico | +525556229122 | | helga@ib.unam.mx | Taxonomy & sytematics of Rubiaceae; cladistics. | View |
| NUNES DA SILVA, THALES | Brazil | 34999810430 | | thalesnsilva@gmail.com | | View |
| NS, Prasanna | India | 9964297803 | | prasanna.ns@atree.org | | View |
| NORMAN, ELIANE M. | United States | 407-279-8699 | | elianen@aol.com | Buddleja and related genera; Asimina & Deeringothamnus (Annonaceae); reproductive biology of Florida plants; travels of Andre Michaux. | View |