The letters in this collection relate mainly to Trelease’s determinations of Piperaceae, particularly Piper Linnaeus and Peperomia Ruiz & Pavon, and occasionally of Loranthaceae; a few relate to specimens of Cuscuta, sent to Yuncker through Trelease. There is also a group of letters (ca.1929) relating to a biographical memoir of John Merle Coulter, a book Trelease was writing for the National Academy of Arts and Sciences. These letters are from Coulter’s widow, Georgie; his son Stanley; and various persons from whom Trelease had requested information concerning Coulter’s life and work. In addition, this collection contains letters concerning Trelease’s work (ca.1928) on Piperaceae for the North American Flora (New York, New York Botanical Garden, 1954). There are a few letters relating to other publications by Trelease, including an article (ca.1929) in Contributions from the U.S. National Herbarium on “The Piperaceae of Costa Rica,” and work by other botanists. There is essentially no material relevant to his work at St. Louis and Illinois, the Missouri Botanical Garden or his extensive botanical travels.

Correspondents in this collection are listed here by name, followed by the date(s) of their correspondence.

Arthur, Joseph Charles (1850–1942): 10 October 1925, 17 November 1925, 3 May 1929, 30 July 1929, 12 August 1929, 7 September 1929, 20 October 1929, 30 September 1930, 28 October 1930

Bailey, Liberty Hyde (1858–1954): 23 July 1926, 15 August 1929, 7 October 1937, 20 May 1940

Barnhart, John Hendley (1871–1949): 17 August 1928

Beal, William James (1833–1924): 11 January 1893

Bessey, Charles Edwin (1845–1915): 1 January 1894

Bolle, August Franz Friedrich Albert (1905–1999): 26 January 1931

Box, Harold Edmund (1898–1973): 3 August 1939

Bracelin, Nina Floy (1890–1973): 30 November 1938, 14 September 1939

Brandegee, Townshend Stith (1843–1925): 26 May 1920, 26 July 1919

Bravo, José J. (?-[1926]): 27 June 1924; 29 October 1924

Briquet, John Isaac (1870–1931): 9 February 1923, 30 May 1926, 3 March 1931

Britton, Nathaniel Lord (1859–1934): 1 August 1928, 15 February 1930

Buchtien, Otto {August} (1859–1946): 6 January 1929, 7 June 1929

Bush, Benjamin Lincoln (1858–1937): 14 May 1921

Camp, Wendell Holmes (1905–1963): 24 August 1937, 6 October 1937, 18 October 1937

Camus, Aimée Antoinette (1879–1965): 17 August 1938; 18 October 1938 [postcards]

Candolle, Louise Frossard de Saugy de (1875–1973): 11 February 1924

Cattell, James McKeen (1891–1944): 11 May 1928, 23 May 1931

Christensen, Carl Frederick Albert (1872–1942): 9 January 1926

Chrysler, Mintin Asbury (1871–1963): 8 January 1941, 14 May 1941

Conklin, Edwin Grant (1863–1952): 6 July 1938

Coulter, Georgie M. (1853–1934): 19 April 1929, 22 April 1929, 7 August 1929, 13 October 1929

Coulter, John Merle (1851–1928): 6 March 1916, 19 November 1919, 6 June 1925

Coulter, Stanley (1953–1943): 26 April 1929, 13 August 1929

Cowles, Henry Chandler (1869–1939): 21 September 1927

Crevasse, Joseph M. Jr. (1915–2012): 11 March 1941

Crocker, William (1876–1950): 8 May 1929

Domin, Karel (1882–1953): 31 January 1929

Dorf, A. T.: 22 October 1929

Engler, Heinrich Gustav Adolf (1844–1930): 3 February 1926

Erwin, Arthur Thomas (1874–1970): 16 June 1930, 22 November 1933

Eschauzier, Francis (1861–1924): 11 February 1919

Farlow, William Gilson (1844–1919): 26 November 1918, 22 April 19? (ca.1918)

Fosberg, Francis Raymond (1844–1919): 25 February 1941

Gage, Simon Henry (1851–1944): 24 July 1924, 21 December 1940

Gagnepain, François (1866–1952): 26 February 1931

Gilmour, John Scott Lennox (1906–1986): 18 April 1934, 29 June 1934

Gleason, Henry Allan (1882–1975): 6 November 1929

Gooding, Evelyn Graham Beaujon (1915–1987): 2 February 1942

Handel-Mazzetti, Heinrich Raphael Eduard von (1882–1940): 7 September 1927, 4 January 1928

Harshberger, John William (1869–1829): 24 October 1925, 14 May 1926

Herter, Wilhelm Gustav (1884–1958): 18 January 1934, 28 February 1935, 3 July 1937, 25 August 1937, 3 March 1939, 15 April 1939, 6 February 1940

Hinton, George Boole (1883–1943): 20 January 1941

Hill, Arthur William (1875–1941): 5 December 1932, 20 November 1934

Hitchcock, Albert Spear (1865–1935): 20 March 1924

Hochreutiner, Bénédict Pierre Georges (1873–1959): 20 October 1933, 20 March 1935

Issatchenko, Boris Lavrent'evich (1871–1948): 8 February 1929

Jack, John George (1861–1949): 12 July 1928

Jepson, William Linn (1867–1946): 9 October 1919

Johnston, Ivan Murray (1898–1960): 14 November 1930

Jones, Lewis Ralph (1864–1945): 24 January 1934, 28 February 1934

Killip, Ellsworth Paine (1890–1968): 25 September 1928, 16 September 1932, 23 September 1938, 17 November 1942

Lankester, Charles Herbert (1879–1969): 4 June 1930

Lecomte, Paul Henri (1856–1934): 27 December 1922

Léon, (Frère) Hermano (1871–1955): 8 February 1927, 7 August 1944

Lunell, Joel (1851–1920): 21 June 1915

MacBride, James Francis (1892–1976): 5 June 1925

Maxon, William Randolph (1877–1948): 31 December 1928, 15 May 1929, 28 August 1929, 30 August 1929, 12 September 1929, 13 September 1929, 12 November 1929

Mexia, Ynes Enriquetta Julietta (1870–1938): October 1926

Millspaugh, Charles Frederick (1854–1923): 31 July 1913

Molisch, Hans (1856–1937): 16 May 1926

Morgan, Thomas Hunt (1866–1945): 25 March 1929

Morse, Edward Sylvester (1838–1925): 24 June 1925

Mottier, David Myers (1864–1940): 18 October 1929

Nelson, Aven (1859–1952): 15 April 1929, 1 July 1929

Page, Abbott Chandler (1856–1946): 15 January 1918, 23 December 1940, 23 March 1941

Pammel, Louis Hermann (1862–1931): 7 July 1930

Pennell, Francis Whittier (1886–1952): 15 January 1929

Pittier, Henri François (1857–1950): 26 July 1923 [to F. L. Stevens]

Power, Frederick Belding (1853–1927): 18 January 1915

Prain, David (1857–1944): 3 August 1915

Ramsbottom, John (1885–1974): 20 July 1936, 9 September 1936

Raunkiaer, Christen Christiansen (1860–1938): 28 October 1919

Rehder, Alfred (1863–1949): 5 July 1928, 10 November 1928, 5 December 1928, 8 May 1934, 9 November 1934

Rice, James Henry Jr. (1868–1935): 19 October 1931, 15 December 1931, 17 July 1932, 18 November 1932

Robinson, Benjamin Lincoln (1864–1935): 28 July 1929

Robyns, Frans Hubert Edouard Arthur Walter (1901–1986): 8 December 1931, 7 March 1932

St. John, Harold (1892–1991): 20 July 1928, 18 May 1930

Sanderson, Ruth Dexter (1891–ca.1951): 27 July 1929

Sargent, Charles Sprague (1841–1927): 7 May 1925

Seifriz, William (1888–1955): 7 October 1938, 19 October 1938

Shepardson, Francis Wayland (1862–1937): 4 May 1929

Shimek, Bohumil (1861–1937): 2 June 1917

Skinker, C. F.: 11 December 1935

Small, John Kunkel (1869–1938): 1 August 1929

Solheim, Wilhelm Gerard (1898–1978): 21 December 1933

Standley, Paul Carpenter (1884–1963): 6 August 1929, 21 March 1932

Strasburger, Eduard Adolf (1844–1912): 11 January 1895

Tischler, Georg Friedrich Leopold (1878–1955): 31 December 1925

Urban, Ignatius (1848–1931): 23 November 1925, 13 March 1927, 2 October 1930

Wetmore, Alexander (1886–1978): 24 June 1929

White, David (1862–1935): 11 October 1929

Williams, Robert Statham (1859–1945): 3 March 1925

Wilson, Ernest Henry (1876–1930): 22 October 1928, 29 October 1928

Woodson, Robert Everard (1904–1963): 7 November 1939, 21 February 1940

Woronoff, Georges (1874–1931): 27 February 1928, 17 November 1929, 6 April 1930, n.d.

Author Unknown (to H. Humbert, Phanérogame, Musée d’Histoire Naturelle): 1 September 1937