- Travis, Sara
- Trávníček, Bohumil
- Travouillon, Kenny J.
- Traxler, Chas. J.
- Traykova, Boryanka
- Trayler, Kerry
- Traylor, Clayton
- Traylor, Idris R.
- Traylor, Melvin A. (Melvin Alvah), 1915-2008
- Traynier, R M M
- Traynor, Bradley
- Traynor, Janice.
- Trazi, Alessandro
- Trazzi, Alessandro
- Trbojevic, Ivana
- TRC Mariah Associates.
- Treacher, W. H. Sir, (William Hood), 1849-1919
- Treadaway, Colin G
- Treadwell Gardens,
- Treadwell Nursery Co.
- Treadwell, Aaron L. (Aaron Louis), 1866-1947
- Treadwell, Daniel
- Treadwell, Rhonda
- Trealby, Barbara
- Treanor, John J.
- Treasure Oak Nursery.
- Treasurer, James W
- Treat, Asher E. (Asher Eugene), 1907-2004
- Treat, Mary, 1830-1923
- Treat, Willard E
- Treaty of Washington (1871 May 8) 1871 May 8-
- Trebbau, Pedro
- Trebeck, P. N.
- Trebeck, Prosper N
- Trębicki, Łukasz
- Trebicki, Piotr
- Trebilcock, R. E.
- Trebilcock, Samantha
- Trebino, Ana
- Trebitsch, Rudolf
- Trebitz, Anett
- Treboux, Octave
- Trebs, Ivonne
- Trecartin, John S.
- Trechsel, Gaspard, active 1529-1549
- Trechsel, Melchior, active 1529-1549
- Treco, Fernando
- Treco, Fernando Rodrigo
- Trécul, Auguste Adolphe Lucien, 1818-1896
- Tredgold, Thomas, 1788-1829
- Tree Acres (Nursery)
- Tree Land Nurseries.
- Tree, A. J.
- Tree, Desley J
- Treeland Nurseries.
- Tree-Land, Inc.,
- Treeline Ecological Research.
- Treeman & Munger (Firm)
- Treese, Thomas.
- Trefault, Nicole
- Trefethen, James B.
- Trefry, Helen E.
- Trefry, William Davis Thayer, 1852-
- Tregarthen, J. C. (John Coulson), 1854-1933
- Tregaskis, James
- Tregear, Vincent
- Tregellas, T. H.
- Tregellas, Tom
- Tregellas, Tom H
- Tregelles, George Fox
- Tregenza, Tom
- Tregidga, Emma
- Trego, Kent
- Trego, Kent D.
- Trego, Marisa L
- Tregonning, R. J.
- Trehan, K. N.
- Trehane, R. P.
- Treher Eberly, Amanda
- Treherne, R. C. (Reginald Charles), 1886-1924
- Treholme Gardens.
- Trei, Kelli
- Treib, Marc, 1943-
- Treiber, Reinhold
- Treichel, R. L.
- Treichler, R.
- Treigienė, A
- Treilhard, Jean-Baptiste, 1742-1810
- Treille
- Treiman, Thomas B.
- Trein, Fabrício Locatelli
- Treitschke, Georg Friedrich, 1776-1842
- Trejo Escareño, H. I.
- Trejo P., Juana Lourdes.
- Trejo Torres, Jorge Carlos
- Trejo, Ana
- Trejo, Dora
- Trejo, Irma
- Trejo-Cordova, Alfredo
- Trejo-Hernández, Laura
- Trejo-López, Carlos
- Trejo-Loyo, Adriana Gabriela
- Trejo-Macías, Genoveva
- Trejo-Martínez, Alejandro B.
- Trejo-Ortiz, Aída
- Trejo-Salazar, Roberto Emiliano
- Trejo-Tapia, Gabriela
- Trejo-Téllez, Libia Iris
- Trekels, Maarten
- Trela, Joanna
- Trelease, Helen M
- Trelease, Sam Farlow, 1892-
- Trelease, William, 1857-1945
- Trelles, Carlos M. (Carlos Manuel), 1866-1951
- Treloar, H. M.
- Treloar, Michelle A.
- Tremaine, Mrs.
- Tremarin, Priscila I.
- Trematerra, Pasquale
- Tremayne, Harold.
- Trembath, Dane
- Trembath, Dane F.
- Tremblay, E.
- Tremblay, G. C.
- Tremblay, Jean-Pierre
- Tremblay, Julien
- Tremblay, Raymond L.
- Tremblay, S.
- Tremblay, Sophie
- Trembley, Abraham, 1710-1784
- Trembley, Ralph, approximately 1817-
- Tremblin, G
- Tremenheere, Captain
- Tremenheere, George Borlase
- Tremetsberger, Karin
- Tremewan, W. Gerald
- Treminio, Samuel
- Tremlett, J D
- Tremolada, Paolo
- Trémolières, P.
- Trémols y Borrell, Federico
- Tremor, John W
- Tremor, Scott
- Trémouilles, Edgardo R.
- Tremper Holly Farm,
- Tremper, Joanne
- Tremul, Peter Raymond
- Trenbath, Jakki
- Trench, Merriley E
- Trench, Robert Kent
- Trencheva, Katya
- Trenchi, Alejandra
- Trenchi, Maurizio
- Trendall, A. F. (Alec Francis)
- Trendall, Jasper
- Trendall, Kathleen
- Trendel, Jean Michel
- Treneman, Nancy
- Trenerry, Michael P.
- Trengove, David
- Trengove, J W
- Trengove, R. D. (Robert Donald)
- Trenkin, Vladislav
- Trent, James D
- Trent, Jonathan S
- Trent, Mary, Mrs.
- Trentini, Massimo
- Trentini, Rosita F. R.
- Trenton Natural History Society.
- Tresca, Salvadore, 1750?-1815
- Treschman, Keith
- Treseder, John G. (John Garland), 1841-1923
- Treseder, Leslie.
- Tresling, Gerrit, 18th cent-
- Tresmondi, Fernanda
- Trespalacios-Rangel, Alba Alicia
- Tressens, Sara G.
- Tressler, Donald Kiteley, 1894-
- Tressler, Willis L. (Willis Lattanner)
- Tresso, Mayara Rodrigues
- Trest, M T
- Tresz, Hilda
- Tretiach, M
- Tretiach, Mauro
- Trettau, Waldemar
- Tretter, Ludwig.
- Treu, R
- Treub, Melchior, 1851-1910
- Treuer, Tim
- Treuge, Julius
- Treutler, Hans C.
- Treuttel and Würtz.
- Treuttel et Würtz,
- Trevathan, Charles E.
- Trevejo, Giannina
- Trevejo, Luis,
- Trevelin, Leonardo
- Trevelin, Leonardo C.
- Trevelyan, Charles E. (Charles Edward), 1807-1886
- Trevelyon, O. M.
- Trevenar, Rob
- Trevenen Gardens,
- Treves, Frederick, 1853-1923
- Trevine, Vivian
- Trevine, Vivian C.
- Treviño Fernández, José Cándido
- Treviño Garza, Eduardo J.
- Treviño Neávez, Jaime Francisco
- Treviño, Carlos H.
- Treviño, Hugo
- Treviño, Jesús Alcázar
- Treviño-Carreón, Jacinto
- Treviño-Garza, Eduardo
- Treviño-Garza, Eduardo Javier
- Treviño-Zevallos, Italo F.
- Treviranus, Gottfried Reinhold, 1776-1837
- Treviranus, Ludolph Christian, 1779-1864
- Trevisa, John, 1402
- Trevisan, André
- Trevisan, Maria Teresa Salles
- Trevisan, Rafael, 1980-
- Trevisan, Roberta Rafaela
- Trevisan, Victor B A
- Trevisan, Vittore, 1818-1897
- Trevithick, Francis, 1812-1877
- Trevizan, Lucas Noboru Fatori
- Trevizani, Raphael
- Trevor, Charles Gerald
- Trevor, Miles
- Trevor, Tudor G. (Tudor Gruffydd), 1865-
- Trevor‐battye, Aubyn
- Trevor-Battye, Aubyn Bernard Rochfort, 1855-1922
- Trevor-Jones, Andrew
- Trew, Christoph Jacob, 1695-1769
- Trew, Houston R
- Trewavas, Ethelwynn
- Trewavas, Ethelwynn
- Treweek, Allison
- Treweek, Jo
- Trewick, Steven A.
- Trewin, N. H.
- Trewin, R. W.
- Trexel, Dale R.
- Trexler, Carson
- Trexler, David
- Trexler, Dennis T.
- Trezise, A.
- Trezzi, Giuliano
- Tri, Andrew N.
- Trial, Joan Garner.