- Arbeláez M., Natalia
- Arbeláez, A L
- Arbeláez, M V
- Arbeláez-Rojas, Gustavo
- Arbelo, E
- Arber, Agnes Robertson, 1879-1960
- Arber, E. A. Newell (Edward Alexander Newell), 1870-1918
- Arbetman, Marina P
- Arbib, Robert S
- Arbino, Manuel O
- Arbisser, Ilana.
- Arbo, María Mercedes
- Arbocco, G
- Arbocz, Géza de Faria
- Arbogast, Brian S.
- Arbogast, R T
- Arbogast, Richard Terrance, 1937-
- Arboleda, Santiago
- Arbor, Ann
- Arboretum Foundation (Seattle, Wash.)
- Arboretum national des Barres.
- Arboretum of Los Angeles County.
- Arbost, M J
- Arbour, D
- Arbour, Jessica H
- Arbuthnott, Barbara Elrington, Lady, 1822-1904
- Arcadi, J A
- Arcadia Dahlia Gardens.
- Arcadia Equipment Development Center.
- Arcadia Nurseries.
- Arcadia, L.
- Arcagni, Marina
- Arcangeli, A
- Arcangeli, G. (Giovanni), 1840-1921
- Arcanjo, DDR.
- Arcanjo, Renan Vieira
- Arce de Hamity, Martha Gladys.
- Arce Domínguez, Fabiola
- Arce H., Mariangeles.
- Arce, Juan A.
- Arce, Julio Eduardo
- Arce, L.
- Arce, Nallely
- Arce, Paul Gonzáles
- Arce, Silvia
- Arcega-Cabrera Flor
- Arce-Montoya, Mario
- Arceo Guzmán, Mario E.
- Arceo, G.
- Arceo, Patricia
- Arceo-Carranza, Daniel
- Arceo-Gomez, Joselito
- Arce-Pérez, Roberto.
- Arcese, Peter
- Arcet, Jean d', 1725-1801
- Arch Street Nurseries.
- Arch Tirado, Emilio
- Archambault, Daniel J. (Daniel Jean-Paul), 1966-
- Archambault, Jacques
- Archambault, Sylvain
- Archambeault, Sophie L.
- Archangelsky, Ana
- Archangelsky, Miguel
- Archangelsky, Sergio
- Archangelsky, Sergio
- Archbold Biological Station
- Archbold Expedition to Arizona (1940)
- Archbold Expedition to New Guinea (1933-1934)
- Archbold Expedition to New Guinea (1936-1937)
- Archbold Expedition to New Guinea (1938-1939)
- Archbold Expedition to New Guinea (1953)
- Archbold Expedition to New Guinea (1956-1957)
- Archbold Expedition to New Guinea (1959)
- Archbold Expedition to New Guinea (1964)
- Archbold, Edwin F.
- Archbold, Neil W
- Archbold, Richard.
- Archdeacon, James W.
- Archen, Louis.
- Archer & Vavra.
- Archer, A. F.
- Archer, A. L.
- Archer, Alan W
- Archer, Allan F., 1908-1994
- Archer, Allan Frost, 1908-
- Archer, D. M.
- Archer, Ellinor
- Archer, Fredrick I
- Archer, G. Stephens.
- Archer, J., active 1792-
- Archer, L W
- Archer, Melanie S.
- Archer, Michael E. (Michael Edward)
- Archer, Michael, 1945-
- Archer, Milton C., 1940-
- Archer, Simon.
- Archer, Steven R
- Archer, T. C.
- Archer, Thomas Croxen, 1817-1885
- Archer, Tim.
- Archer, W. Andrew (William Andrew), 1894-1973
- Archer, William
- Archer, William E.
- Archer, William Henry, 1825-1909
- Archer, William, 1827-1898
- Archer, William, 1830-1897
- Archer's Gardens.
- Archey, Gilbert 1890-1974
- Archiac, vicomte d' (Etienne Jules Adolphe Desmier), 1802-1868
- Archias' Floral Co.
- Archias' Seed Store.
- Archias, J. C.
- Archias, L. H.
- Archias, Leon Henry, 1869-1944
- Archias’ Seed Store.
- Archibald Farms Ltd.
- Archibald, E. S. (Edgar Spinney), 1885-1968
- Archibald, Eily E A
- Archibald, Herbert L.
- Archibald, Patricia A.
- Archibald, R E M
- Archibald, R G
- Archibald, R. A.
- Archibald, Ralph W.
- Archibald, Robert George.
- Archibald, S. Bruce
- Archibeque, Jennifer Ziegelmeyer
- Archibold, O. W. 1958-
- Archibold, W.
- Archie, James W.
- Archila Morales, Fredy L., 1973-
- Archinard, P. É. (Paul Émile)
- Archives nationales (France)
- Archivo General de Simancas.
- Archuby, Diego I.
- Archuby, Fernando
- Archwood Farm
- Arcifa, Marlene Sofia.
- Arcila, Dahiana
- Arciniegas, Arelis,
- Arckenhaugen.
- Arco, Yolanda
- Arconada, Beatriz
- Arconati Visconti, Giovanni Martino.
- Arcons, Cesar d', 1681
- Arcos R., Dagoberto F.
- Arcos, Adriana Lucia
- Arcos, Adriano Nobre
- Arcos, Fernando
- Arcos-Ortega, G. Fabiola
- Arco-Verde, Marcelo Francia
- Arctic Aeromedical Laboratory (U.S.)
- Arctic Health Research Center. Entomology Section,
- Arculeo, Marco
- Arculus, R. J.
- Arcuri, Andreza Cristina Dias
- Arcury, Thomas A.
- Ardagh, John
- Ardaiolo, Matthew
- Ardaka, I Made
- Ardelean, Adorian
- Ardenghi, N. M. G.
- Ardenghi, PG.
- Ardévol y Cabré, Jaime
- Ardhaka, L M
- Ardi, Wisnu Handoyo
- Ardia, Daniel R
- Ardila Arias, Alba Nelly
- Ardila, Gustavo
- Ardila-Camacho, Adrian
- Ardila-Espitia, Néstor E. (Néstor Enrique)
- Ardila-Robayo, María Cristiba
- Ardila‐robayo, María Cristina
- Ardila-Téllez, Juan David
- Ardiles Huerta, Victor
- Ardiles, Carmen Fernández
- Ardiles, Karen
- Ardiles, Víctor
- Ardill, Peter
- Arding and Merrett,
- Arding, W., active 1821-
- Ardinghelli, M. A. (Maria Angela), 1728-1825
- Ardisson, Pedro
- Ardissone, Francesco, 1837-1910
- Arditi, Roger
- Arditti, Joseph
- Ardiwijaya, Rizya L
- Ardiyani, M
- Ardley, Edward
- Ardmore Nursery.
- Ardoin, Paul, 1918-1978
- Ardoin, Pierre
- Ardoino, Honoré
- Ardón, Marcelo
- Ardré, F
- Ardrey, R. L.
- Ardrey, Robert L.
- Arduin, Marcos
- Arduini, P
- Arduini, Paolo
- Arduino, Pietro, 1728-1805
- Ardura, Alba
- Arduser, Michael
- Arduser, Mike
- Arêa Leão, Antonio Eugenio de, 1895-1971
- Areces, A.J.
- Areces-Mallea, Alberto E
- Arechavala-Lopez, Pablo
- Arechavaleta, José, 1838-1912
- Areekul, Buntika
- Areendran, G.
- Areendran, S.
- Arefina-Armitage, Tatiana
- Areiza, Astrid
- Arellano L., Jorge
- Arellano Martínez, Marcial
- Arellano Nicolás, Edith
- Arellano Sanaphre, Alejandro
- Arellano, E Solana
- Arellano, Gisella
- Arellano, Lucrecia
- Arellano, María L.
- Arellano, Mirta AL
- Arellano, Mirta L de
- Arellano-Gil, M.
- Arellano-Martinez, Marcial
- Arellano-Martínez, Marcial
- Arellano-Martínez, Marcial
- Arellano-Méndez, Leonardo
- Arena, Derrick A
- Arena, Filippo, 1708-1789
- Arena, Jay M.
- Arena, Michele C
- Arenal, F
- Arenander, Erich Oscar.
- Arena-Ortiz, L
- Arenas D, Sandra
- Arenas Julio, YR
- Arenas Ocampo, Martha Lucía
- Arenas Posada, Juan Antonio
- Arenas, José
- Arenas, Pastor
- Arenas, Patricia M
- Arenas, Patricia Marta
- Arenas-Fuentes, Virgilio
- Arenas-Monroy José Carlos
- Arenas-Moreno Diego M
- Arenas-Moreno, Diego M.
- Arenas-Ocampo, Martha Lucía
- Arenberg, Ernest D'