Etienne Denisse (French, 1785–1861)
Sebastian Kneipp (German, 1821 – 1897)
Anna Maria Hussey (English, 1805 – 1853)
Nikolaus Joseph Freiherr von Jacquin (Dutch, 1727 – 1817)
Jacob Marrel (German, 1613-1681)
Arentina Hendrica Arendsen (Dutch, 1836 - 1915)
Louis Antoine Cusin (French, 1824-1901)
Mary Vaux Walcott (American, 1860-1940)
Mary Vaux Walcott (American, 1860-1940)
Louis Antoine Cusin (French, 1824-1901)
Jean Jules Linden (Belgian, 1817-1898)
Royal Charles Steadman (American, 1875 – 1964)
William Roxburgh (Scottish, 1751 – 1815)
Thomas Andrew Knight (English, 1759–1838)
Sydenham Edwards (English, 1768-1819)
Friedrich Berge (German, 1811-1883)
Ellen Isham Schutt (American, 1873 – 1955)
Mary Vaux Walcott (American, 1860-1940)
Charles Antoine Lemaire (French, 1800-1871)
Jean Jules Linden (Belgian, 1817-1898)
Lorenzo Berlèse (Italian, 1784-1863)
Arentina Hendrica Arendsen (Dutch, 1836 - 1915)
François Hérincq (French, 1820 – 1891)
Sarah Featon (New Zealander, 1848 – 1927)
Charles Frederick Millspaugh (American, 1854 – 1923)
Royal Charles Steadman (American, 1875 – 1964)