- Porter, S L
- Porter, S. S.
- Porter, Sanford D
- Porter, Teresita M.
- Porter, Thomas C. (Thomas Conrad), 1822-1901
- Porter, V. O., 1880-1955
- Porter, Walter P.
- Porter, William Lyon.
- Porter, William Townsend, 1862-1949
- Portères, Roland
- Porterfield (Firm)
- Porterfield, D. A.
- Porterfield, Jean C.
- Porterfield, S. M.
- Porterfield, W M
- Porter-Morgan, Holly
- Porter's Nurseries.
- Porter-Utley, Kristen
- Porter-Walton Co.
- Portes, C. E. B.
- Portes, Carlos Eduardo
- Portes, Francisco
- Portes, MT.
- Portevin, G
- Portfors, Christine V.
- Portheim, Leopold Ritter V
- Portier, Bruno
- Portier, Marc
- Portier, Paul, 1866-1962
- Portier, Rémy
- Portik, Daniel M
- Portilia, Andrea,
- Portilla, Alex
- Portillo, Alfonso
- Portillo, Dennis
- Portillo, Jorge López
- Portillo, M
- Portillo-Clark, Guillermo
- Portillo-Quintero, Carlos
- Portis, Alessandro, 1853-1931
- Portland (Or.)
- Portland (Oregon) Girl Scout Council.
- Portland Beauty Gardens.
- Portland Camellia Nursery.
- Portland cement association, Chicago.
- Portland Cement Association.
- Portland Nursery Co.
- Portland Rose Nursery (Portland, Or.)
- Portland Rose Society (Portland, Or.)
- Portland Seed & Pet Store.
- Portland Seed Co.
- Portland Seed Company
- Portland Seed Company (Portland, Ind.)
- Portland Seed Company.
- Portland Society of Natural History (Me.)
- Portland Wholesale Nursery Company.
- Portland Young Men's Christian Association.
- Portland, Margaret Cavendish Holles Harley, duchess of, 1714-1785
- Portlock
- Portlock, Nathaniel, 1748?-1817
- Portman, Arthur F. B.
- Portman, Lodewyk Gotlieb, 1772-
- Portman, M V
- Portman, R
- Portman, Richard
- Portman, Zach
- Portman, Zachary
- Portmann, A
- Portmann, Adolf, 1897-1982
- Portmann, Julia M.
- Portmann, Olivia Grace
- Portner, H O
- Portner, Talia
- PörtnerHans-Otto
- Portnov, Aleksey
- Portnoy, John W
- Porto Alegre Ferreira, Priscila
- Porto Rico Agricultural Experiment Station.
- Porto Supi, Karolaine
- Porto, Ana Lúcia Figueiredo
- Porto, Arthur
- Porto, Danianne Enéias
- Porto, Daniel Brito
- Porto, Diego
- Porto, Diego Sasso
- Porto, F. E.
- Porto, Gabriele R.
- Porto, Jorge I. R.
- Porto, Jorge Ivan Rebelo
- Porto, Juliana R.
- Porto, Karla R. A.
- Pôrto, Kátia Cavalcanti
- Porto, Louise
- Porto, Lucas
- Porto, M González
- Porto, Márcia Valéria Da Fonseca
- Porto, Maria Luiza
- Porto, Marilena Ramos
- Porto, Miguel
- Porto, P Campos
- Porto, Tatiana Souza
- Porto, Tiago Jordão
- Porto, Willians
- Portocarrero, C A
- Porto-Foresti, F.
- Porto-Foresti, Fabio
- Porto-Foresti, Fábio
- Port-Rose Garden.
- Ports, M
- Ports, Mark A
- Portschinsky, J
- Portschinsky, J A
- Portugal Santana, André
- Portugal, Adriana Brizon
- Portugal, António
- Portugal.
- Portugal. Cortes.
- Portugal. Impressão Régia.
- Portugal. Junta da Administração do Tabaco.
- Portugal. Sovereign (1521-1557 : John III)
- Portugal. Sovereign (1640-1656 : John IV)
- Portugal. Sovereign (1750-1777 : Joseph)
- Portugal. Sovereign (1777-1816 : Maria I)
- Portugal-Portugal, D
- Portugal-Zegarra, Gandhy
- Portus, A. B.
- Portus, Maria Isabel G.
- Portwood, Bruce E.
- Porycka, Katarzyna
- Posa, Mary Rose C
- Posada Osorio, Santiago
- Posada P., Tibisay
- Posada R, William Andrés
- Posada, Blanca
- Posada, Blanca O.
- Posada, Camila
- Posada, Francisco
- Posada, Isabella
- Posada, Juan
- Posada, Santiago
- Posada-Arango, André
- Posada-Arango, M A
- Posada-F Francisco J
- Posada-Flórez, Francisco Javier
- Posada-Herrera, Juan Mauricio
- Posada-Peláez, Camila
- Posada-Posada, Blanca O
- Posadas, Paula
- Posamentier, Heimo
- Poscharsky, Gustav Adolf, 1832-
- Poschinger, Ferdinand von, 1898-1958
- Pöschl, Artur
- Poscolere, Grazielle Dias
- Poselger, H. (Heinrich), 1818-1883
- Posepny, Franz A
- Posey, Chesley Johnston, 1906-
- Posey, Darrell A.
- Posey, James B.
- Posey, Maryhelen.
- Posey, Walter Benjamin.
- Poshiwa, Xavier
- Posillipo, Giandomenico
- Posnansky, Merrick.
- Posner, Jack.
- Posner, Michael I.
- Posos-Ponce, P
- Pospelov, Michael N.
- Poss, Stuart G
- Possebon Cyrino, José Eurico
- Posser, Eduarda
- Posser, Pedro M.
- Posse-Sarmiento, Valentina
- Possete, Rafael Fernando Da Silva
- Possette, Rafael Fernando da Silva
- Possevino, Antonio, 1533-1611
- Possimoser, Dalvan
- Possingham, Hugh
- Posso, Sérgio R.
- Posso, SR
- Posso, SR.
- Posson, Neil F
- Posson, R. J. (Rutherford Jay), 1890-
- Posson's Seed Store.
- Possum Hollow Nurseries,
- Post, Albert S.
- Post, Angela R
- Post, Arthur Edwin,
- Post, Boyd W.
- Post, Charles Johnson, 1873-1956
- Post, Charles T
- Post, D C
- Post, David C
- Post, E J
- Post, Frank M.
- Post, George E. (George Edward), 1838-1909
- Post, Greg
- Post, John R.
- Post, Karen E.
- Post, Katherine C
- Post, M. J.
- Post, Peter W
- Post, R L
- Post, Richard L
- Post, Steve.
- Post, Thelma B
- Post, Thomas Erik von, 1858-1912
- Post, William
- Postai, Claudomiro
- Postal Microscopical Society.
- Postans, J
- Postans, Lieut J
- Postans, Thomas
- Postans, W
- Postel, E
- Postel, Emil.
- Postel, Emile
- Postels, A. (Aleksandr), 1801-1871
- Postey, Rosemary
- Posthumus, P.
- Postiglioni, Rodrigo
- Postigo Mijarra, José María
- Postle, A C
- Postle, Anthony
- Postle, Leonie
- Postlethwait, John H
- Postlethwait, S N
- Postma, John, 1867-
- Postma, Lianne
- Postman, Joseph
- Postner, Martin
- Poston, Bert
- Poston, M E
- Poston, Muriel E
- Post's Nursery.
- Post'S Plant Nursery,
- Postupalsky, S
- Posy Bed,
- Poszig, Dörte
- Potanin, G. N. 1835-1920
- Potapov, Anton
- Potapov, E
- Potapov, Eugene R
- Potapov, Grigory
- Potapov, Grigory S.
- Potapov, Mikhail
- Potapov, Mikhail B
- Potapov, R L
- Potapowicz, Maya
- Potarsky, Karina
- Potascheff, Carolina de Moraes