| Name | Born | Died | Country | Abbrev. | Reference |
| Henry Robert Nicollon Des Abbayes | 1898 | 1974 | France | Abbayes | |
| Ernst Victor Abbott | 1899 | 1980 | United States | E.V.Abbott | |
| Aleksandra Aleksandrovna Ablakatova | 1907 | 1988 | Russia | Ablak. | |
| Ivan Nikolayevich Abramov | 1884 | 1953 | Russia | Abramov | |
| Erik Acharius | 1757 | 1819 | Sweden | Ach. | |
| Michel Adanson | 1727 | 1806 | France | Adans. | |
| Rudolph Ferdinand Theodor Aderhold | 1865 | 1907 | Germany | Aderh. | |
| Adam Afzelius | 1750 | 1837 | Sweden | Afzel. | |
| Carl Adolph Agardh | 1785 | 1859 | Sweden | C.Agardh | |
| Jacob Georg Agardh | 1813 | 1901 | Sweden | J.Agardh | |
| Geoffrey Clough Ainsworth | 1905 | 1998 | United Kingdom | Ainsw. | |
| Libero Ajello | 1916 | 2004 | United States | Ajello | |
| Henry Carl Aldrich | 1941 | 2005 | United States | |
| Carlo Luciano Alessio | 1919 | 2006 | Italy | Alessio | |
| Constantine John Alexopolous | 1907 | 1986 | United States | Alexop. | |
| Ruth F. Allen | 1879 | 1963 | United States | |
| Lawrence Marion Ames | 1900 | 1966 | United States | L.M.Ames | |
| David Arora | 1953 | | United States | D.Arora | |
| Joseph Charles Arthur | 1850 | 1942 | United States | Arthur | |
| George Francis Atkinson | 1854 | 1918 | United States | G.F.Atk. |
|
| Churchill Babington | 1821 | 1889 | United Kingdom | C.Bab. | |
| Charles David Badham | 1805 | 1857 | United Kingdom | Badham | |
| Gladys Elizabeth Baker | 1908 | 2007 | United States | G.E.Baker | |
| Giuseppe Gabriel Balsamo-Crivelli | 1800 | 1874 | Italy | Bals.-Criv. | |
| Robert Joseph Bandoni | 1926 | 2009 | Canada | Bandoni | |
| Howard James Banker | 1866 | 1940 | United States | Banker | |
| Mary Elizabeth Banning | 1832 | 1901 | United States | Banning | |
| Alma Joslyn Whiffen-Barksdale | 1916 | 1981 | United States | Whiffen | |
| Heinrich Anton de Bary | 1831 | 1888 | Germany | de Bary | |
| Lekh Raj Batra | 1929 | 1999 | India | L.R.Batra | |
| August Johann Georg Karl Batsch | 1761 | 1802 | Germany | Batsch | |
| Giovanni Antonio Battarra | 1714 | 1789 | Italy | Batarra | |
| Gaspard Bauhin | 1560 | 1624 | Switzerland | C.Bauhin | |
| Johann Bauhin | 1541 | 1613 | Switzerland | J.Bauhin | |
| Dow Vauter Baxter | 1898 | 1965 | United States | D.V.Baxter | |
| Henry Curtis Beardslee | 1865 | 1948 | United States | Beardslee | |
| Günther Beck von Mannagetta und Lerchenau | 1856 | 1931 | Austria | Beck | |
| Maurice Beeli | 1879 | 1957 | Belgium | Beeli | |
| Everett Smith Beneke | 1918 | 2010 | United States | Beneke | |
| Chester Ray Benjamin | 1923 | 2002 | United States | C.R.Benj. | |
| Miles Joseph Berkeley | 1803 | 1889 | United Kingdom | Berk. | |
| Christine Marie Berkhout | 1893 | 1932 | Netherlands | Berkh. | |
| Charles Edwin Bessey | 1845 | 1915 | United States | Bessey | |
| Ernst Athearn Bessey | 1877 | 1957 | United States | E.A.Bessey | |
| Agathe L. van Beverwijk | 1907 | 1963 | Netherlands | Beverw. | |
| Howard E. Bigelow | 1923 | 1987 | United States | H.E.Bigelow | |
| Margaret Elizabeth Barr-Bigelow | 1923 | 2008 | United States | M.E.Barr | |
| Chapman Hunter Binford | 1900 | 1990 | United States | Binford | |
| Guy Richard Bisby | 1889 | 1958 | United States | Bisby | |
| Meredith Blackwell | | | United States | Blackwell | |
| Albert Francis Blakeslee | 1874 | 1954 | United States | Blakeslee | |
| Carl Ludwig Blume | 1789 | 1862 | Germany | Blume | |
| Mary Cecilia Bodman | 1905 | 1982 | United States | Bodman | |
| James Bolton | 1758 | 1799 | United Kingdom | Bolton | |
| Marcel Bon | 1925 | | France | Bon | |
| Lee Bonar | 1891 | 1977 | United States | Bonar | |
| Hermann Friedrich Bonorden | 1801 | 1884 | Germany | Bonord. | |
| Aimé Jacques Alexandre Bonpland | 1773 | 1858 | France | Bonpl. | |
| Jean Louis Émile Boudier | 1828 | 1920 | France | Boud. | |
| Hubert Bourdot | 1861 | 1937 | France | Bourdot | |
| Julius Oscar Brefeld | 1839 | 1925 | Germany | Bref. | |
| Giacomo Bresadola | 1847 | 1929 | Italy | Bres. | |
| Nathaniel Lord Britton | 1859 | 1934 | United States | Britton | |
| Max Britzelmayr | 1839 | 1909 | Germany | Britzelm. | |
| Irwin M. Brodo | 1935 | | Canada | Brodo | |
| Frederick Thom Brooks | 1882 | 1952 | United Kingdom | F.T.Brooks | |
| Travis E. Brooks | 1917 | 1976 | United States | T.E.Brooks | |
| Christopher Edmund Broome | 1812 | 1886 | United Kingdom | Broome | |
| Thomas D. Bruns | | | United States | T.D.Bruns | |
| Arthur Henry Reginald Buller | 1874 | 1944 | Canada | Buller | |
| Jean Baptiste François Pierre Bulliard | 1742 | 1793 | France | Bull. | |
| Gertrude Simmons Burlingham | 1872 | 1952 | United States | Burl. | |
| John Harrison Burnett | 1922 | 2007 | United Kingdom | J.H.Burnett | |
| Thomas Jonathan Burrill | 1839 | 1916 | United States | Burrill | |
| Edward Angus Burt | 1859 | 1939 | United States | Burt | |
| Edwin John Butler | 1874 | 1943 | United Kingdom | E.J.Butler | |
| A. P. de Candolle | 1778 | 1841 | Switzerland | DC. | |
| James Cedric Carter | 1905 | 1981 | United States | J.C.Carter | |
| George Washington Carver | 1864 | 1943 | United States | Carver | |
| Edith Katherine Cash | 1890 | 1992 | United States | E.K.Cash | |
| Karel Cejp | 1900 | 1979 | Czech Republic | Cejp | |
| Ladislav František Čelakovský | 1863 | 1916 | Czech Republic | L.F.Čelák. | |
| Ignacio Chapela | | | United States | Chapela | |
| Carlos E. Chardon | 1897 | 1965 | Puerto Rico | |
| Vera Katherine Charles | 1877 | 1954 | United States | Charles | |
| Margaret Brooks Church | 1889 | 1976 | United States | Church | |
| Zdeněk Černohorský | 1910 | 2001 | Czech Republic | |
| Stanisław Chełchowski | 1866 | 1907 | Poland | | |
| Raffaele Ciferri | 1897 | 1964 | Italy | Cif. | |
| John Burton Cleland | 1878 | 1971 | Australia | Cleland | |
| Frederick Edward Clements | 1874 | 1945 | United States | Clem. | |
| George Perkins Clinton | 1867 | 1937 | United States | G.P.Clinton | |
| Vincent W. Cochrane | 1916 | 1987 | United States | |
| William Chambers Coker | 1872 | 1953 | United States | Coker | |
| O'Neil Ray Collins | 1931 | 1989 | United States | |
| Ibra Lockwood Conners | 1894 | 1989 | Canada | Conners | |
| Melville Thurston Cook | 1869 | 1952 | United States | M.T.Cook | |
| Orator Fuller Cook | 1867 | 1949 | United States | O.F.Cook | |
| Mordecai Cubitt Cooke | 1825 | 1914 | United Kingdom | Cooke | |
| William Bridge Cooke | 1908 | 1991 | United States | W.B.Cooke | |
| August Carl Joseph Corda | 1809 | 1849 | Czech Republic | Corda | |
| Edred John Henry Corner | 1906 | 1996 | United Kingdom | Corner | |
| Marie Maxime Cornu | 1843 | 1901 | France | Cornu | |
| Carl Franz Joseph Erich Correns | 1864 | 1933 | Germany | Correns | |
| Julien Noël Costantin | 1857 | 1936 | France | Costantin | |
| A.D. Cotton | 1879 | 1962 | United Kingdom | Cotton | |
| Charles Crossland | 1844 | 1916 | United Kingdom | Crossl. | |
| George Baker Cummins | 1904 | 2007 | United States | Cummins | |
| Gordon Herriot Cunningham | 1892 | 1962 | New Zealand | G.Cunn. | |
| Frederick Currey | 1819 | 1881 | United Kingdom | Curr. | |
| Kathleen Maisey Curtis | 1892 | 1994 | New Zealand | K.M.Curtis | |
| William Curtis | 1746 | 1799 | United Kingdom | Curtis | |
| Victor Macomber Cutter | 1917 | 1962 | United States | Cutter | |
| Grant Dooks Darker | 1898 | 1979 | United States | Darker | |
| John Dearness | 1852 | 1954 | Canada | Dearn. | |
| Frederick Claude Deighton | 1903 | 1992 | United Kingdom | Deighton | |
| Edouard Georges Delacroix | 1858 | 1907 | France | Delacr. | |
| R.W.G. Dennis | 1910 | 2003 | United Kingdom | Dennis | |
| Giuseppe De Notaris | 1805 | 1877 | Italy | De Not. | |
| William Clark Denison | 1928 | 2005 | United States | Denison | |
| Aurel Dermek | 1929 | 1989 | Slovakia | Dermek | |
| René Louiche Desfontaines | 1750 | 1833 | France | Desf. | |
| Dennis E. Desjardin | 1950 | | United States | Desjardin | |
| John Baptiste Henri Joseph Desmazières | 1786 | 1862 | France | Desm. | |
| Nicaise Auguste Desvaux | 1784 | 1856 | France | Desv. | |
| James Dickson | 1738 | 1822 | Scotland | Dicks. | |
| James G. Dickson | 1891 | 1962 | United States | J.G.Dicks. | |
| William Webster Diehl | 1891 | 1978 | United States | Diehl | |
| Johann Jacob Dillenius | 1687 | 1747 | Germany | Dill. | |
| Joan Dingley | 1916 | 2008 | New Zealand | Dingley | |
| Bernard Ogilvie Dodge | 1872 | 1960 | United States | B.O.Dodge | |
| Carroll William Dodge | 1895 | 1988 | United States | C.W.Dodge | |
| Ethel Mary Doidge | 1887 | 1965 | South Africa | Doidge | |
| Tadeusz Dominik | 1909 | 1980 | Poland | Dominik | |
| Marinus Anton Donk | 1908 | 1972 | Netherlands | Donk | |
| Charles Drechsler | 1892 | 1986 | United States | Drechsler | |
| Edouard Drouhet | 1919 | 2000 | France | Drouhet | |
| Benjamin Minge Duggar | 1872 | 1956 | United States | Duggar | |
| Barthélemy Charles Joseph Dumortier | 1797 | 1878 | Belgium | Dumort. | |
| Catherine Gross Duncan | 1908 | 1968 | United States | |
| Elias Judah Durand | 1870 | 1922 | United States | E.J.Durand | |
| Franklin Sumner Earle | 1856 | 1929 | United States | Earle | |
| Finn-Egil Eckblad | 1923 | 2000 | Norway | Eckblad | |
| Claude Wilbur Edgerton | 1880 | 1965 | United States | Edgerton | |
| Christian Gottfried Ehrenberg | 1795 | 1876 | Germany | Ehrenb. | |
| Jakob Friedrich Ehrhart | 1742 | 1795 | Germany | Ehrh. | |
| Mary Elizabeth Elliott | 1923 | 1976 | Canada | M.E.Elliott | |
| Job Bicknell Ellis | 1829 | 1905 | United States | Ellis | |
| Ralph Emerson | 1912 | 1979 | United States | R.Emers. | |
| Chester Wilson Emmons | 1900 | 1985 | United States | C.W.Emmons | |
| Stephan Ladislaus Endlicher | 1804 | 1849 | Austria | Endl. | |
| George Engelmann | 1809 | 1884 | United States | Engelm. | |
| Constantin von Ettingshausen | 1826 | 1897 | Austria | Ettingsh. | |
| Benjamin Matlack Everhart | 1818 | 1904 | United States | Everh. |
| William Leigh Williamson Eyre | 1841 | 1914 | United Kingdom | Eyre | |
| Charles E. Fairman | 1856 | 1934 | United States | Fairm. | |
| Richard Falck | 1868 | 1955 | Austria | Falck | |
| William Gilson Farlow | 1844 | 1919 | United States | Farl. | |
| Olga Fassatiová | 1924 | | Czech Republic | Fassat. | |
| Joseph Horace Faull | 1876 | 1961 | Canada | Faull | |
| Victor Fayod | 1860 | 1900 | Switzerland | Fayod | |
| Dorothy Irene Fennell | 1916 | 1977 | United States | Fennell | |
| Charles Leonard Fergus | 1917 | 1986 | United States | Fergus | |
| William Grady Fields | 1933 | 1975 | United States | Fields | |
| John Fincham | 1926 | 2005 | United Kingdom | |
| Bruce Fink | 1861 | 1927 | United States | Fink | |
| Eduard Fischer | 1861 | 1939 | United States | E.Fisch. | |
| Harry Morton Fitzpatrick | 1886 | 1949 | United States | Fitzp. | |
| Julius von Flotow | 1788 | 1856 | Germany | Flot. | |
| Ivan Focht | 1927 | 1992 | Croatia | | |
| Georg Forster | 1754 | 1794 | Germany | G.Forst. | |
| Lorraine Friedman | | 2001 | United States | Friedman | |
| Elias Magnus Fries | 1794 | 1878 | Sweden | Fr. | |
| Theodor Magnus Fries | 1832 | 1913 | Sweden | Th.Fr. | |
| Charles Christopher Frost | 1805 | 1880 | United States | Frost | |
| Bruce A. Fuhrer | | | Australia | Fuhrer | |
| Joseph Gaertner | 1732 | 1791 | Germany | Gaertn. | |
| Edward Garber | 1918 | 2004 | United States | |
| Guglielmo Gasparrini | 1803 | 1866 | Italy | Gasp. | |
| Charles Gaudichaud-Beaupré | 1789 | 1854 | France | Gaudich. | |
| Ernst Albert Gäumann | 1893 | 1963 | Switzerland | Gäum. | |
| Edward Garber | 1918 | 2004 | United States | |
| Paul Emil Elliot Gelting | 1905 | 1964 | Denmark | Gelting | |
| Léon Gaston Genevier | 1830 | 1880 | France | Genev. | |
| William Ruggles Gerard | 1841 | 1914 | United States | W.R.Gerard | |
| James Wessell Gerdemann | 1921 | 2008 | United States | Gerd. | |
| Ewald Gerhardt | | | Germany | Ew.Gerhardt | |
| Edward Martinius Gilbert | 1875 | 1956 | United States | E.M.Gilbert | |
| Helen Margaret Gilkey | 1886 | 1972 | United States | Gilkey | |
| Joseph Charles Gilman | 1890 | 1966 | United States | J.C.Gilman | |
| Johann Friedrich Gmelin | 1748 | 1804 | Germany | J.F.Gmel. | |
| Nina Sergeevna Golubkova | 1932 | 2009 | Ukraine | N.S.Golubk. | |
| William Laurence Gordon | 1901 | 1963 | Canada | W.L.Gordon | |
| David Gottlieb | 1911 | 1982 | United States | |
| Samuel Frederick Gray | 1766 | 1828 | United Kingdom | Gray | |
| Henry Campbell Greene | 1904 | 1967 | United States | H.C.Greene | |
| James Walton Groves | 1906 | 1970 | Canada | J.W.Groves | |
| David Gruby | 1810 | 1898 | Hungary | Gruby | |
| Gro Gulden | 1939 | | Norway | Gulden | |
| Johan Ernst Gunnerus | 1718 | 1773 | Norway | Gunnerus | |
| Gastón Guzmán | 1932 | | Mexico | Guzman | |
| Helen Gwynne-Vaughan | 1879 | 1967 | United States | Gwynne-Vaughan | |
| Byron David Halsted | 1852 | 1918 | United States | Halst. | |
| Emil Christian Hansen | 1842 | 1909 | Denmark | E.C.Hansen | |
| Kanesuke Hara | 1885 | 1962 | Japan | Hara | |
| H. W. Harkness | 1821 | 1901 | United States | Harkn. | |
| Robert Almer Harper | 1862 | 1946 | United States | |
| Kenneth Archibald Harrison | 1901 | 1991 | Canada | K.A.Harrison | |
| David Leslie Hawksworth | 1946 | | United Kingdom | D.Hawksw. | |
| Elizabeth Lee Hazen | 1885 | 1975 | United States | |
| Frigyes Ákos Hazslinszky | 1818 | 1896 | Hungary | Hazsl. | |
| Roger Heim | 1900 | 1979 | France | R.Heim | |
| Paul Heinemann | 1916 | 1996 | Belgium | Heinem. | |
| Paul Christoph Hennings | 1841 | 1908 | Germany | Henn. | |
| Aino Marjatta Henssen | 1925 | 2011 | Finland | Henssen | |
| Josef Herink | | | Czech Republic | Herink | |
| Lexemuel Ray Hesler | 1888 | 1977 | United States | Hesler | |
| David S. Hibbett | | | United States | Hibbett | |
| Naoharu Hiratsuka | 1873 | 1946 | Japan | Hirats. | |
| Bronislav Hlůza | 1929 | | Czech Republic | |
| Hermann Hoffmann | 1819 | 1891 | Germany | H.Hoffm. | |
| Franz Xaver Rudolf von Höhnel | 1852 | 1920 | Austria | Höhn. | |
| Johan Theodor Holmskjold | 1731 | 1793 | Denmark | Holmsk. | |
| Edward Willet Dorland Holway | 1853 | 1923 | United States | Holw. | |
| Natsurang Homchantara | 1957 | 2006 | Thailand | | |
| Edwin Earle Honey | 1891 | 1956 | United States | Honey | |
| Tsuguo Hongo | 1923 | 2007 | Japan | Hongo | |
| Joseph Dalton Hooker | 1817 | 1911 | United Kingdom | Hook.f. | |
| John W. Hotson | 1870 | 1957 | United States | Hotson | |
| Frank Leslie Howard | 1903 | 1997 | United States | |
| Zdeněk Hubálek | | | Czech Republic | Hubálek | |
| Anna Maria Hussey | ca. 1820 | 1877 | United Kingdom | Hussey | |
| Emil J. Imbach | 1897 | 1970 | Germany | Imbach | |
| Henry Alexander Carmichael Jackson | 1877 | 1961 | Canada | H.A.C.Jacks. | |
| Nikolaus Joseph von Jacquin | 1727 | 1817 | Netherlands | Jacq. | |
| Anna Eliza Jenkins | 1886 | 1973 | United States | Jenkins | |
| Jon Duane Jensen | 1953 | 1986 | United States | J.D.Jensen | |
| Abraham Z. Joffe | 1909 | 2000 | Israel | Joffe | |
| George Thomas Johnson | 1916 | 1981 | United States | |
| Fred Reuel Jones | 1884 | 1956 | United States | F.R.Jones | |
| Ivar Jørstad | 1887 | 1967 | | Jørst. | |
| Károly Kalchbrenner | 1807 | 1886 | Hungary | Kalchbr. | |
| Julius Kane | 1925 | 2001 | Canada | J.Kane | |
| Gustav Karl Wilhelm Hermann Karsten | 1817 | 1908 | Germany | H.Karst. | |
| Petter Adolf Karsten | 1834 | 1917 | Finland | P.Karst | |
| Calvin Henry Kauffman | 1869 | 1931 | United States | Kauffman | |
| William Ashbrook Kellerman | 1850 | 1908 | United States | Kellerm. | |
| Bryce Kendrick | 1933 | | United Kingdom | W.B.Kendr. | |
| Frank Dunn Kern | 1883 | 1973 | United States | F.Kern | |
| František Kotlaba | 1927 | | Czech Republic | Kotl. | |
| Hanns Kreisel | 1931 | | Germany | Kreisel | |
| Louis Charles Christopher Krieger | 1873 | 1940 | United States | L.Krieg. | |
| Julius Vincenz von Krombholz | 1782 | 1843 | Czech Republic | Krombh. | |
| Julius Gotthelf Kühn | 1825 | 1910 | Germany | J.G.Kühn | |
| Robert Kühner | 1903 | 1996 | Germany | Kühner | |
| Paul Kummer | 1834 | 1912 | Germany | P.Kumm. | |
| Otto Kuntze | 1843 | 1907 | Germany | Kuntze | |
| Syo Kurokawa | 1926 | 2010 | Japan | Kurok. | |
| Jakob Emanuel Lange | 1864 | 1941 | Denmark | J.E.Lange | |
| Knud Morten Lange | 1919 | 2003 | Denmark | M.Lange | |
| Michael J. Larsen | 1938 | 2000 | United States | M.J.Larsen | |
| Jacques Désiré Leandri | 1903 | 1982 | France | Leandri | |
| George Aleck Ledingham | 1903 | 1962 | Canada | Ledingham | |
| Paul Arenz Lemke | 1937 | 1995 | United States | P.A.Lemke | |
| Charles de l'Écluse | 1526 | 1609 | Belgium | Clus. | |
| Jens Lind | 1874 | 1939 | Denmark | Lind | |
| Gustav Lindau | 1866 | 1923 | Germany | Lindau | |
| David Hunt Linder | 1899 | 1946 | United States | Linder | |
| Johann Heinrich Friedrich Link | 1767 | 1850 | Germany | Link | |
| Carl Linnaeus | 1707 | 1778 | Sweden | L. | |
| William Henry Long | 1867 | 1947 | United States | Long | |
| Josiah Lincoln Lowe | 1905 | 1997 | United States | J.Lowe | |
| Rudolph Arnold Maas Geesteranus | 1911 | 2003 | Netherlands | Maas Geest. | |
| Edwin Butterworth Mains | 1890 | 1968 | United States | Mains | |
| Charles McIlvaine | 1840 | 1909 | United States | McIlv. | |
| Thomas Huston Macbride | 1848 | 1934 | United States | T.Macbr. | |
| René Maire | 1878 | 1949 | France | Maire | |
| George Willard Martin | 1886 | 1971 | United States | G.W.Martin | |
| Ludmila Marvanov | 1932 | | Czech Republic | Marvanová | |
| Edmund Mason Williams | 1890 | 1975 | United Kingdom | E.W.Mason | |
| George Edward Massee | 1850 | 1917 | United Kingdom | Massee | |
| John Macoun | 1831 | 1920 | Canada | Macoun | |
| Edwin Butterworth Mains | 1890 | 1968 | United States | Mains | |
| Nestor Léon Marchand | 1833 | 1911 | France | Marchand | |
| Carl Friedrich Philipp von Martius | 1794 | 1868 | Germany | Mart. | |
| Patrick Brandon Matheny | 1969 | | United States | Matheny | |
| Alphonse Louis Paul Matruchot | 1863 | 1921 | France | Matr. | |
| Tom May | | | Australia | T.W.May | |
| Konstantin Mereschkowski | 1855 | 1921 | Russia | Mereschk. | |
| Charles Edward Miller | 1925 | 1984 | United States | C.E.Mill. | |
| Georg Friedrich Wilhelm Meyer | 1782 | 1856 | Germany | G.Mey | |
| Julian Howell Miller | 1890 | 1961 | United States | J.H.Mill. | |
| Orson K. Miller, Jr. | 1930 | 2006 | United States | O.K.Mill. | |
| Arthur Jackson Mix | 1888 | 1956 | United States | Mix | |
| Kingo Miyabe | 1860 | 1951 | Japan | Miyabe | |
| Jean Pierre François Camille Montagne | 1784 | 1866 | France | Mont. | |
| Bland Symington Montenecourt | 1942 | 1987 | United States | |
| Jiří Moravec | 1943 | | Czech Republic | J.Moravec | |
| Pierre Marie Arthur Morelet | 1809 | 1892 | France | |
| Andrew Price Morgan | 1836 | 1907 | United States | Morgan | |
| Meinhard Moser | 1924 | 2002 | Austria | M.M.Moser | |
| Irene Mounce | 1894 | 1987 | United States | Mounce | |
| Ferdinand von Mueller | 1825 | 1896 | Germany | F.Muell. | |
| Emil Müller | 1920 | 2008 | Switzerland | E. Müll. | |
| William Alphonso Murrill | 1869 | 1957 | United States | Murrill | |
| Karl Wilhelm von Nägeli | 1817 | 1891 | Switzerland | Nägeli | |
| Ian Axel Nannfeldt | 1904 | 1985 | United States | Nannf. | |
| Christian Gottfried Daniel Nees von Esenbeck | 1776 | 1858 | Germany | Nees | |
| Gustav Niessl von Mayendorf | 1839 | 1919 | Austria | Niessl | |
| Frank Newhook | | | New Zealand | |
| Mildred Katherine Nobles | 1903 | 1993 | | Nobles | |
| Machiel Noordeloos | 1949 | | Netherlands | Noordel. | |
| William Nylander | 1822 | 1899 | Finland | Nyl. | |
| Lauritz William Olson | 1945 | 1992 | United States | |
| Robert T. Orr | 1908 | 1994 | United States | | |
| P.D. Orton | 1916 | 2005 | United Kingdom | P.D.Orton | |
| Casper van Overeem | 1893 | 1927 | Netherlands | Overeem | |
| Lee Oras Overholts | 1890 | 1946 | United States | Overh. | |
| Alfred Nickolaevich Oxner | 1898 | 1973 | Ukraine | Oxner | |
| Robert Meredith Page | 1919 | 1968 | United States | |
| Kenneth E. Papa | 1931 | 1986 | United States | |
| Frederick Parker-Rhodes | 1914 | 1987 | United Kingdom | Park.-Rhodes | |
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| Flora Wambaugh Patterson | 1847 | 1928 | United States | F.Patt. | |
| Jean-Jacques Paulet | 1740 | 1826 | France | Paulet | |
| A. A. Pearson | 1874 | 1954 | United Kingdom | A.Pearson | |
| Charles Horton Peck | 1833 | 1917 | United States | Peck | |
| Christiaan Hendrik Persoon | 1761 | 1836 | Netherlands | Pers. | |
| Thomas Petch | 1870 | 1948 | United Kingdom | Petch | |
| Adrianuc Pijper | 1886 | 1964 | Netherlands | Pijper | |
| Albert Pilát | 1903 | 1974 | Czech Republic | Pilát | |
| Ronald H. Petersen | 1934 | | United States | R.H.Petersen | |
| Charles Bagge Plowright | 1849 | 1910 | United Kingdom | Plowr. | |
| Eduard Friedrich Poeppig | 1791 | 1868 | Germany | Poepp. | |
| Illtyd Buller Pole-Evans | 1879 | 1968 | South Africa | Pole-Evans | |
| Flora G. Pollack | 1919 | 1997 | United States | Pollack | |
| Rene Pomerleau | 1904 | 1993 | Canada | Pomerl. | |
| Patricio Ponce de León | 1919 | 2010 | Cuba | P.Ponce de León | |
| Zdeněk Pouzar | 1932 | | Czech Republic | Pouzar | |
| Karel Presl | 1794 | 1852 | Czech Republic | C.Presl. | |
| Nathanael Pringsheim | 1823 | 1894 | Germany | Pringsh. | |
| Lucien Quélet | 1832 | 1899 | France | Quél. | |
| Edwin John Queskett | 1808 | 1847 | | E.J.Quekett | |
| Gottlob Ludwig Rabenhorst | 1806 | 1881 | Germany | Rabenh. | |
| Constantine Samuel Rafinesque | 1783 | 1840 | France | Raf. | |
| Jörg H. Raithelhuber | | | | Raithelh. | |
| John Ramsbottom | 1885 | 1974 | United Kingdom | Ramsb. | |
| Robert Delafield Rands | 1890 | 1970 | United States | Rands | |
| Kenneth Bryan Raper | 1908 | 1987 | United States | Raper | |
| Carleton Rea | 1861 | 1946 | United Kingdom | Rea | |
| Scott Redhead | 1950 | | Canada | Redhead | |
| Heinrich Rehm | 1828 | 1916 | Germany | Rehm | |
| Ludwig Reichenbach | 1793 | 1879 | Germany | Rchb. | |
| Derek Reid | 1927 | 2006 | United Kingdom | D.A.Reid | |
| Harald Udo von Reidl | 1936 | | Austria | Rield | |
| Adalbert Ricken | 1851 | 1921 | Germany | Ricken |
| Henry Nicholas Ridley | 1855 | 1956 | United Kingdom | Ridl. | |
| Clark Thomas Rogerson | 1918 | 2001 | United States | Rogerson | |
| Henri Romagnesi | 1912 | 1999 | France | Romagn. | |
| Emil Rostrup | 1831 | 1907 | Denmark | Rostr. | |
| George Dewey Rühle | 1898 | 1962 | United States | Rühle | |
| Georg Eberhard Rumphius | 1628 | 1702 | Germany | Rumph. | |
| Pier Andrea Saccardo | 1845 | 1920 | Italy | Sacc. | |
| Augustin Saint-Hilaire | 1799 | 1853 | France | A.St.-Hil. | |
| Heinrich Sandstede | 1859 | 1951 | Germany | Sandst. | |
| Vsevolod Pavlovic Savicz | 1885 | 1872 | Russia | Savicz | |
| Douglas Barton Osborne Savile | 1919 | 2000 | Canada | Savile | |
| Jacob Christian Schäffer | 1718 | 1790 | Germany | Schaeff. | |
| Julius Schäffer | 1882 | 1944 | Germany | Jul.Schäff. | |
| Diederich Franz Leonhard von Schlechtendal | 1794 | 1866 | Germany | Schltdl. | |
| Joseph Schröter | 1837 | 1894 | Germany | J.Schröt. | |
| Franz Paula von Schrank | 1747 | 1835 | Germany | Schrank | |
| Stephan Schulzer von Müggenburg | 1802 | 1892 | Hungary | Schulzer | |
| Marie Beatrice Schol-Schwarz | 1898 | 1969 | Netherlands | M.B.Schwarz | |
| Lewis David von Schweinitz | 1780 | 1834 | United States | Schwein. | |
| Giovanni Antonio Scopoli | 1723 | 1788 | Italy | Scop. | |
| Fred Jay Seaver | 1877 | 1970 | United States | Seaver | |
| Louis Secretan | 1758 | 1839 | Switzerland | Secr. | |
| Steve Selva | 1948 | | United States | Selva |
| Arthur Bliss Seymour | 1859 | 1933 | United States | Seym. | |
| Leland Shanor | 1914 | 1993 | United States | Shanor | |
| Charles Gardner Shaw | 1917 | 1998 | United States | C.G.Shaw | |
| Cornelius Lott Shear | 1865 | 1956 | United States | Shear | |
| John Sibthorp | 1758 | 1796 | United Kingdom | Sibth. | |
| Margarita Silva-Hutner | | 2002 | Puerto Rico | | |
| James Whaples Sinden | 1902 | 1994 | | Sinden | |
| Rolf Singer | 1906 | 1994 | Germany | Singer | |
| Alexander Hanchett Smith | 1904 | 1986 | United States | A.H.Sm. | |
| Annie Lorrain Smith | 1854 | 1937 | United Kingdom | A.L.Sm. | |
| James Edward Smith | 1759 | 1828 | United Kingdom | Sm. | |
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| Roderick Sprague | 1901 | 1962 | United States | R.Sprague | |
| Kurt Sprengel | 1766 | 1833 | Germany | Spreng. | |
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| Fidel Tapia | | | | F.Tapia | |
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| Anthony M. Young | | | Australia | A.M.Young | |
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| Alexander Zahlbruckner | 1860 | 1939 | Austria | Zahlbr. | |
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| Friedrich Wilhelm Zopf | 1846 | 1909 | Germany | Zopf | |
| George Lorenzo Zundel | 1885 | 1950 | United States | Zundel | |