- Allen, Pablo E.
- Allen, Paul E.
- Allen, Paul H. (Paul Hamilton), 1911-1963
- Allen, Peter
- Allen, Phoebe.
- Allen, Priscilla M.
- Allen, R. L. (Richard Lamb), 1803-1869
- Allen, R. L.,
- Allen, Richard Charles.
- Allen, Richard H.
- Allen, Richard K.
- Allen, Robert D
- Allen, Robert Day, 1927-1986
- Allen, Robert L.
- Allen, Robert Lloyd.
- Allen, Robert P
- Allen, Robert Porter, 1905-1963
- Allen, Robert T.
- Allen, Ross
- Allen, Ruth, 1911-
- Allen, S Stafford
- Allen, Sally.
- Allen, Samuel.
- Allen, Sarah C.
- Allen, Sarah G
- Allen, Selena Dawn
- Allen, Shilah D.
- Allen, Shirley W. 1883-1968
- Allen, Simon
- Allen, Standish K.
- Allen, Sterling & Lothrop.
- Allen, Suzy.
- Allen, T
- Allen, T. C.
- Allen, Terri
- Allen, Thomas George, 1885-
- Allen, Thomas Hunter
- Allen, Thomas J.
- Allen, Thomas, 1813-1882
- Allen, Tim (John Timothy), 1953-
- Allen, Timothy Field, 1837-1902
- Allen, V. R.
- Allen, W Cavan
- Allen, W. A. (Botanist)
- Allen, W. A. (Entomologist)
- Allen, W. C.
- Allen, W. F.
- Allen, W. J.
- Allen, W. R.
- Allen, Walter Fox.
- Allen, Wendy B
- Allen, William A.
- Allen, William A. (William Alonzo), 1848-1944
- Allen, William B. Jr.
- Allen, William F. (William Fitch), 1875-1951
- Allen, William Henry, 1808-1882
- Allen, William Ray, 1885-1955
- Allen, William W.
- Allen, William, 1793-1864
- Allen, William.
- Allen, Willis Boyd, 1855-1938
- Allen, Winfred Emory, 1873-1947
- Allen, Zachariah, 1795-1882
- Allen., Joel Asaph
- Allenbach Nursery.
- Allenbach, Wm.
- Allenbaugh, Gordon L
- Allen-Brown, A.
- Allen-Brown, D.
- Allende-Canseco Jazive
- Allender, B M
- Allender, Rachael
- Allen-Diaz, Barbara H
- Allen-Rowlandson, T S
- Allen's Nurseries and Seed House.
- Allen's Water Gardens.
- Allenspach, N.
- Alléon-Dulac, Jean Louis, 1723-1788
- Alleoni, Luís Reynaldo Ferracciú
- Aller, Theresa L
- Allert, Thomas
- Allerton, Reuben G.
- Allerton, Samuel Waters, 1828-
- Allescher, Andreas, 1828-1903
- Allestry, James, 1670
- Alletson, T
- Alletson, Tom
- Alletz, Pons Augustin
- Alletz, Pons Augustin, 1703-1785
- Alley, Anthony
- Alley, Henry.
- Alley, Jack R.
- Alley, Neville F
- Alley, Otis Edward, 1899-
- Alley, Wayne P. (Wayne Paul)
- Alleyne, Haynes Gibbes.
- Allez, George
- Allgaier, Howard J
- Allgaier, Martin
- Allgemeine Deutsche Ornithologische Gesellschaft.
- Allgemeine Entomologische Gesellschaft.
- Allgemeine Schweizerische Gesellschaft für die Gesamten Naturwissenschaften.
- Allgén, C. A. (CarlAlgon), 1886-1960
- Allgood, Andrew.
- All-Grow Seed House.
- Alliance Nurseries.
- Alliance Nursery Company.
- Allied Bulb Growers of Puget Sound, Inc.
- Allied Growers Seed Co.
- Allied Seed Company.
- Alliegro, Mark C
- Alliende, M. Angélica
- Allievi, M. I.
- Allin, A. E.
- Alling, Abigail.
- Alling, C. Louis.
- Alling, Harold L. (Harold Lattimore), 1888-1960
- Allioni, Carlo, 1725-1804
- Allis, Edward Phelps, 1851-1947
- Allis, Thomas 1788-1875
- Allison & Addison (Firm)
- Allison, A. C.
- Allison, Allen.
- Allison, Andrew, 1879-1960
- Allison, Benjamin R
- Allison, Edith M.
- Allison, Edwin C.
- Allison, Franklin E. (Franklin Elmer), 1892-1972
- Allison, H.
- Allison, J. Lewis (Joseph Lewis), 1911-
- Allison, James R.
- Allison, Jeremy D
- Allison, Joseph J.
- Allison, Justin W.
- Allison, L. C.
- Allison, Linda J.
- Allison, Lorraine
- Allison, Lyn
- Allison, Malorye.
- Allison, Peter A
- Allison, R. V. (Robert Verrill) 1896-
- Allison, Richard C
- Allison, T. F. P.
- Allison, Taber D
- Allison, Vernon Charles, 1891-
- Allison, William, 1851-1925
- Allman, George James, 1812-1898
- Allmand, Dorothy
- Allmeling, Christina
- Allmen, H. von
- Allmon, Warren D
- Allo, Jan
- Allom, Elizabeth Anne
- Allom, Thomas, 1804-1872
- Allorge, Lucile
- Allorge, Pierre, 1891-1944
- Allorge, V. (Valentine) 1888-1977
- Alloway, Thomas M
- Allphin, Loreen
- Allport, Gary A
- Allport, Morton
- Allport, Thomas.
- Allred, B. W. (Berten Wendell), 1904-
- Allred, C. Stephen (Coral Stephen), 1942-
- Allred, Darin B.
- Allred, Dorald M., 1923-1996
- Allred, Kelly W. (Kelly Wayne)
- Allred, Kevin.
- Allred, Miriam L.
- Allsop, Quentin
- Allsopp, Peter G.
- Allspach, Andreas
- Allston, Robert F. W. (Robert Francis Withers), 1801-1864
- Alluaud, Ch. (Charles), 1861-1949
- Allum, F. E.
- Allwood Bros.
- Allwood, A J
- Allyn, Arthur C
- Alm Rosenblad, Magnus
- Alm, Gunnar, 1889-
- Alm, Jacob, 1754-1821
- Alm, Steven R.
- Alm, Torbjørn, 1957-
- Alm, Victor
- Alma Nurseries.
- Alma, Sanchez-Santos
- Alma, Solis M
- Almaça, Carlos
- Almada, E. D.
- Almada, Emmanuel D.
- Almada, José de, 1890-
- Almada-Villela, Patricia C.
- Almaghasla, Mustafa
- Almaguer-Sierra, Pedro
- Almand, J. David.
- Almandoz, Gastón O
- Almany, G R
- Almanza-Bernal, Mónica
- Almanza-Marroquín, Viviana
- Almanza-Ramírez, Juan C
- Almanza-Valenzuela Iván
- Al-Maqbali, Dua'A
- Almaral-Mendívil, Alma Rosa
- Almaraz López, Teresa
- Almaraz, Juan José
- Almaraz-Abarca, Norma
- Almaraz-Suárez, Juan J.
- Almazán Núñez, Roberto Carlos
- Almazán-Catalán, José Alberto
- Almazán-Juárez Ángel
- Almazan-Rueda, Pablo
- Almbro, Maria
- Almeda Gardens.
- Almeda, Frank.
- Almeida dos Santos, Marlon
- Almeida Filho, Raimundo.
- Almeida Júnior, Eduardo Bezerra de
- Almeida Júnior, José Otávio Barros
- Almeida Neto, Alcides José de
- Almeida Paz, I. C. L.
- Almeida Pinto, Joaquim de.
- Almeida Pinto, Zeferino.
- Almeida Sá, Patrícia Sheyla de
- Almeida Sacramento, Patricia
- Almeida Sant'Ana, Débora Regina
- Almeida, José Veríssimo de, . 1834-1915
- Almeida, A. C.
- Almeida, A. M.
- Almeida, A. S.
- Almeida, Adriana Monteiro de.
- Almeida, Alex José de.
- Almeida, Alex-Alan Furtado de
- Almeida, Alexandre
- Almeida, Alexandre Nascimento de
- Almeida, Alexandre Oliveira de.
- Almeida, Álvaro F. de
- Almeida, Amanda
- Almeida, Ana C.S.
- Almeida, Ana Laura
- Almeida, Ana Paula Gottlieb
- Almeida, Antonio d', 1767-1839
- Almeida, Antonio de Padua
- Almeida, Argus V.
- Almeida, Ariádine Cristine
- Almeida, Arlete Silva de.
- Almeida, Armando Antunes de
- Almeida, C. A. A.
- Almeida, C. E.
- Almeida, C. M.
- Almeida, C. S.