Joseph Dalton Hooker
Hooker, Joseph Dalton

(b. June 30, 1817 – d. December 10, 1911)

United Kingdom of Great Britain and Ireland

Identified Rubiaceae and collected Poaceae

Charles Christopher Parry
Parry, Charles Christopher

(b. August 28, 1823 – d. February 20, 1890)

United States of America

Identified Polygalaceae and collected Asteraceae

Charles Sprague Sargent
Sargent, Charles Sprague

(b. April 24, 1841 – d. March 22, 1927)

United States of America

Identified Rosaceae and collected Rosaceae

William Starling Sullivant
Sullivant, William Starling

(b. January 15, 1803 – d. April 30, 1873)

United States of America

Identified Hypnaceae and collected Hypnaceae

John Torrey
Torrey, John

(b. August 15, 1796 – d. March 10, 1873)

United States of America

Identified Asteraceae and collected Asteraceae