Frederick Traugott Pursh
Frederick Traugott Pursh (1774 - 11 July 1820) was a German-American botanist. Born in Grossenhain, Saxony, he was educated at Dresden Botanical Gardens, and emigrated to the United States in 1799. From 1802 to 1805 he worked in Philadelphia as the botanical manager of the extensive gardens of William Hamilton, Esq., "The Woodlands." By 1805, he was working for Benjamin Smith Barton on a new flora of North America, under who he studied the plants collected on the Lewis and Clark Expedition. His work with Barton allowed him to travel farther afield. In 1805, he travelled south from Maryland to the Carolinas and in 1806, he travelled north from the mountains of Pennsylvania to New Hampshire. He made both trips principally on foot, with only his dog and a gun, covering over three thousand miles each season.
Barton's proposed flora was never written, but Pursh, who then moved to London, England, did make a major contribution to North American botany in his Flora americae septentrionalis; or A Systematic Arrangement and Description of The Plants of North America, published in 1813. He then returned to America, moving to Canada in 1816. His hopes of carrying out further major work were prevented by ill health due to alcoholism, and he died destitute in Montreal.
His name is commemorated in the genus Purshia (Bitterbush) and in several species, e.g. Rhamnus purshiana.