- Langer, Günther
- Langer, H
- Langer, Karl, Ritter von Edenberg, 1819-1887
- Langer, Peter
- Langer, S. L.
- Langer, Siegfried
- Langeraert, Ward
- Langerak, Gijsbert (Leiden)
- Langerhans, Paul, 1847-1888
- Langermann, Jasmin
- Langeron, Maurice, 1874-1950
- Langers Seed & Floral Co.
- Langers Seed & Floral Company.
- Langethal, Chr. Ed. (Christian Eduard), 1806-1878
- Langeveld Bulb Co. Inc.,
- Langevin, Jean, 1821-1892
- Langfeld, Herbert Sidney, 1879-1958
- Langfeld, Millard, 1872-
- Langford, Mr. (Abraham), 1711-1774
- Langford, Daniel B
- Langford, Darren
- Langford, Emanuel
- Langford, Fritha M
- Langford, George, 1876-1964
- Langford, Jennifer
- Langford, Steven J
- Langford, W G
- Langguth Bonino, Alfredo Ricardo
- Langguth, Christian August, 1754-1814
- Langhans, H.
- Langhoffer, August, 1861-1940
- Langhorne, John, 1735-1779
- Langiaux, Jean
- Langille, J. E.
- Langille, J. H. (James Hibbert), 1841-1923
- Langille, W. A., 1858-1956
- Langkavel, Bernhard August, 1825-1902
- Langlassé, Eugène, 1900
- Langle, R.
- Langle, Richard, Jr.,
- Langlebert, Edmond Jean Joseph, 1817-1894
- Langlès, L. (Louis), 1763-1824
- Langley Research Center.
- Langley, Batty, 1696-1751
- Langley, Chris J.
- Langley, Edward Archer
- Langley, J. N. (John Newport), 1852-1925
- Langley, Jonathan Adam
- Langley, Roger F.
- Langley, Samuel Pierpont, 1834-1906
- Langley, Wilhelmus, 1616-1668
- Langley, William
- Langlois et Leclercq,
- Langlois Floral Garden.
- Langlois, Auguste Barthélemy, 1832-1900
- Langlois, Charles Victor, 1863-1929
- Langlois, David
- Langlois, E. C.
- Langlois, Garret D.
- Langlois, Paul, 1862-1923
- Langlois, Pierre Gabriel, 1754-1810
- Langlumé,
- Langlumé, Pierre, 1790-
- Langmaid, John R.
- Langmaier, Magdalena
- Langmore, Naomi E
- Langmuir, Arthur Comings, 1872-1941
- Langmuir, Irving, 1881-1957
- Lango Reynoso, Fabiola
- Langois, Dr.
- Langone, José A.
- Langoni, Helio
- Langor, David William, 1960-
- Langor, Stephen D
- Langourov, Mario
- Langrand, Olivier
- Langridge, John R.
- Lang's Nursery (Platteville, Wis.)
- Langsdorff, G. H. von (Georg Heinrich), 1774-1852
- Langstaff, R.
- Langston, Robert Lee
- Langston, Wann, Jr. 1921-2013
- Langstroth, L. L. (Lorenzo Lorraine), 1810-1895
- Langstroth, Robert Peter
- Langton, Hugh Hornby, 1862-1953
- Langton, Peter H
- Langton, Thomas, 1849-1914
- Langtry, Walter
- Languasco, Paola
- Languy, Marc
- Langworthy, A. P. (Alan P.)
- Langworthy, C. F. (Charles Ford), 1864-1932
- Langworthy, R A
- Lanham, Urless Norton, 1918-1999
- Lanier, Charles D. (Charles Day), 1868-1945
- Lanier, David Louis, 1950-
- Lanier, Gerald N.
- Lanier, M. C.
- Lanier, Sidney, 1842-1881
- Lanier's (Florala, Ala.)
- Lanigan, Patrick J
- Laning, Barbara A.
- Laning, Enoch. active 1848-1860
- Laning, J. F. (Jay Ford), 1853-1941
- Lanjekar, Vikram Bholanath
- Lanjouw, Joseph, 1902-1984
- Lank, David Berel, 1951-
- Lankester, Charles Herbert, 1879-1969
- Lankester, E. Ray Sir, (Edwin Ray), 1847-1929
- Lankester, Edwin, 1814-1874
- Lankester, Phebe, 1825-1900
- Lankford Nursery.
- Lankford, W. E.
- Lankow, Richard
- Lanktree, John
- Lanktree, P A Desmond
- Lanman, Charles Rockwell, 1850-1941
- Lanna, Joâo
- Lanna, Maria Célia da Silva
- Lanner, Harriette A
- Lanner, Julia
- Lanner, Ronald M., 1930-
- Lanning Seed Company.
- Lanning, Dirk V
- Lanning, F C
- Lanning, George, 1852-1920
- Lanning, Robert G.
- Lannino, Antonella
- Lannoo, Michael J., 1957-
- Lannuzel, Guillaume
- Lanoye, Ferdinand de, 1810-1870
- Lanpher, Frederick K., & co.
- Lanquetin, Paule
- Lanquist, Karl
- Lans, Cheryl A
- Lansac Tôha, Fernando Miranda
- Lansac, Claudia
- Lansac-Tôha, Fábio Amodêo
- Lansberge, J. W. van (Johan Willem), 1830-1903
- Lansburgh & Bro.
- Lansbury, Ivor, 1932-2015
- Lansdown, Richard V
- Lansing, Albert Ingram, 1915-2002
- Lansing, C. F.
- Lansing, Domenica A.
- Lansing, Gerrit Yates, 1783-1862
- Lansing, Robert, 1864-1928
- Lansing, Sarah W.
- Lanspeary, Peter Vernon
- Lanteigne, Jacqueline, 1952-
- Lanteri, Analía Alicia
- Lanteri, Luca
- Lantermann, Werner
- Lanthier, Mario
- Lantieri, Angela
- Lantow, J. L.
- Lantschner, María Victoria
- Lantsov, Vladimir I.
- Lantz, Clark W.
- Lantz, Coulson A.
- Lantz, David E. (David Ernest) 1855-1918
- Lantz, Henrik
- Lantz, L A
- Lantz, Stanley W.
- Lantz, Trevor C, 1974-
- Lantzke, I R
- Lanusse, Agustín
- Lanyon, Scott M, 1956-
- Lanyon, Wesley Edwin, 1926-2017
- Lanz, Arthur
- Lanz, Juan Bautista
- Lanza, Benedetto, 1924-2016
- Lanza, Serena
- Lanza-Espino, Guadalupe de la
- Lanzaro, Gregory Charles, 1950-
- Lanzavecchia, Silvia Beatriz
- Lanzelotti, Paula Laura
- Lanzelotti, Wagner
- Lanzer de Souza, Maria Elizabeth
- Lanzer, Rosane Maria, 1955-
- Lanzieri, Pedro Domingues
- Lanzing, W,. J. R.
- Lanzinger, Michele
- Lanz-Liebenfels, Jörg, 1874-1954
- Lanz-Mendoza, Humberto
- Lanzone, Cecilia
- Lanzrein, Beatrice
- Lao Arenas, María Teresa
- Lao, Ye-Ling
- Laos, Francisca
- Lapa, Antonio José
- Lapage, Geoffrey, 1888-1971
- Laparé, Richard 1952-
- LaPark Seed & Plant Company.
- Lapark Seed and Plant Co.
- Lapayese, Josef
- Lape, Fred, 1900-1985
- Lapedis, Ron
- Lapègue, Sylvie
- Lapenta, Marina Janzantti
- Laperle, Marcel
- LaPerriere, Jacqueline Doyle
- Lapeva-Gjonova, Albena
- Lapham, Increase Allen, 1811-1875
- Lapham, Julia Alcott, 1841-1921
- Lapham, Macy H. (Macy Harvey), 1874-1960
- Lapiana, M.J.
- Lapicque, Louis, 1866-1952
- Lapidin, Johnny
- Lapie, Georges
- Lapied, Emmanuel
- Lapierre, Francis, 1940-
- Lapierre, Hélène, 1957-
- Lapierre, Krystal
- LaPierre, Louis M
- Lapin, Katharina
- Lapin, Marc
- Lapin, Petr Ivanovich, 1909-1986
- LaPine, Timothy R
- Lapinpuro, Lissa
- Lapins, K. O.
- Lapinski, Witold, 1975-
- Lapis, Eraneo B
- LaPlaca Reese, Caroline S
- Laplace, Cyrille Pierre Théodore, 1793-1875
- Laplace, Pierre Simon, marquis de, 1749-1827
- Laplante, Louis
- Laplante, M.
- Laplante, Serge, 1956-
- LaPlume, Greg
- Lapo, Byron
- Lapointe, Brian Edward, 1951-
- Lapointe, François-Joseph, 1966-
- LaPointe, Gisèle
- LaPointe, Joseph L.
- Lapointe, Stéphane
- Lapola, David Montenegro, 1982-
- Lapolla, John S
- Laport, Robert G
- Laporta, Francisco Luis
- Laporta, Gabriel Zorello
- Laporta, Marcia Zorello, 1953-
- Laporte Nursery.
- Laporte, Bernard
- Laporte, Pierre
- Lapota, David
- Lapouge, G De
- Lapparent de Broin, France de, 1938-
- Lapparent, Albert-Félix de, 1905-1975
- Lappas, Petros