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- Allen, Eugene O.
- Allen, Eugene T.
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- Allen, F E
- Allen, F. Sturges (Frederic Sturges), 1861-1920
- Allen, F. W. (Frank Wisdom), 1887-1982
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- Allen, Fred W. Jr.
- Allen, Frederick James, 1864-1927
- Allen, G. F.
- Allen, G. Scott.
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- Allen, George Delwin
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- Allen, George.
- Allen, Georgia.
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- Allen, Gerald Robert
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- Allen, Gilmour M
- Allen, Glenville F
- Allen, Glover M. (Glover Morrill), 1879-1942
- Allen, Grant, 1848-1899
- Allen, H. A.
- Allen, H. W.
- Allen, Hamilton Ford
- Allen, Harriet.
- Allen, Harrison, 1841-1897
- Allen, Harry W. (Harry Willis), 1892-1981
- Allen, Isaac Jackson.
- Allen, Isobel
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- Allen, J. A. (John A.)
- Allen, J. C.
- Allen, J. Fiske.
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- Allen, J. M.
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- Allen, John
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- Allen, John A. (John Alpheus), 1863-1916
- Allen, John A. (John Anthony), 1926-2020
- Allen, John Alphonse.
- Allen, John Fenwick
- Allen, John Fisk.
- Allen, John M. (John Morgan), 1924-
- Allen, John, 1771-1843
- Allen, John, riding master
- Allen, Jonathan (Publisher)
- Allen, Jonathan, 1773-1845
- Allen, K. C.
- Allen, Karen
- Allen, Katherine A.
- Allen, Kathy
- Allen, Kelly E.
- Allen, Kelsey
- Allen, Kenneth (Biologist)
- Allen, Kenneth (Sanitary engineer)
- Allen, L. H.
- Allen, Larry G
- Allen, Lawrence.
- Allen, Lewis F. (Lewis Falley), 1800-1890
- Allen, Linda
- Allen, Linnaeus.
- Allen, Lorna,
- Allen, Louis A.
- Allen, M. James.
- Allen, M. Jean.
- Allen, M. W.
- Allen, Marion E
- Allen, Mark G
- Allen, Martha L
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- Allen, Morrow J.
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- Allen, Neil W
- Allen, Norman, 1900-
- Allen, O. D. (Oscar Dana), 1836-1913
- Allen, P.
- 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, Sally.
- Allen, Samuel.
- Allen, Sarah C.
- Allen, Sarah G
- Allen, Selena Dawn
- Allen, Shilah D.
- 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. 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
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- Alletson, Tom
- Alletz, Pons Augustin
- Alletz, Pons Augustin, 1703-1785
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- 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, 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