- Clark, Scott.
- Clark, Shawn
- Clark, Shawn M
- Clark, Shawn M. (Shawn Meredith), 1955-
- Clark, Stabler & Co.
- Clark, Stephen L
- Clark, Steven D
- Clark, Stewart C.
- Clark, Susan M.
- Clark, T. Edwards (Thomas Edwards)
- Clark, Theresa
- Clark, Thomas H. 1893-1996
- Clark, Thomas.
- Clark, Tim W.
- Clark, Tracy
- Clark, Travis
- Clark, V. de V.
- Clark, Verner I. (Verner Ivan), 1891-
- Clark, Victoria M.
- Clark, Vincent
- Clark, W. A.
- Clark, W. A. V.
- Clark, W. C.
- Clark, W. Dennis
- Clark, W. Mansfield (William Mansfield), 1884-1964
- Clark, W. Sam, 1873-
- Clark, W. W.
- Clark, Wallis H.
- Clark, Walter Augustus.
- Clark, Wayne E. (Wayne Eldon), 1943-
- Clark, Wilfrid Edward Le Gros, 1895-1971
- Clark, William
- Clark, William (Illustrator)
- Clark, William A
- Clark, William Bullock, 1860-1917
- Clark, William Edwin, Mrs.
- Clark, William Edwin.
- Clark, William H
- Clark, William R
- Clark, William S.
- Clark, William Smith, 1826-1886
- Clark, William, 1770-1838
- Clark, William, 1788-1855
- Clark, William, 1841-1902
- Clark, William, Esq.
- Clark, William, of Bath.
- Clarkadota Fig Nurseries.
- Clarke & Keller Seed Store.
- Clarke & Keller.
- Clarke & Rapuano.
- Clarke Bros.
- Clarke Nursery (Long Beach, Wash.),
- Clarke Nursery (San Jose, Calif.)
- Clarke Nursery Co.
- Clarke, A. W.
- Clarke, Adam, approximately 1762-1832
- Clarke, Alfred E.
- Clarke, Andrew
- Clarke, Anne
- Clarke, Anthony R.
- Clarke, Arthur Haddleton, 1926-2014
- Clarke, B. C.
- Clarke, B. J.
- Clarke, Barbara Jean
- Clarke, Barry
- Clarke, Barry T.
- Clarke, Benjamin, 1813-1890
- Clarke, Brenda
- Clarke, C
- Clarke, C C
- Clarke, C. B. (Charles Baron) 1832-1906
- Clarke, C. C., Rev.
- Clarke, C. H. D. (Charles Henry Douglas), 1909-
- Clarke, C. K.
- Clarke, C. M. H.
- Clarke, C. W.
- Clarke, Charles (Biologist)
- Clarke, Charles Baron
- Clarke, Charles E., 1885-1922
- Clarke, Charles, 1826-1909
- Clarke, Charlotte
- Clarke, Christopher T
- Clarke, Cora H. (Cora Huidekoper), 1851-1916
- Clarke, Cyril A. (Cyril Astley), 1907-2000
- Clarke, D. A. (Daniel Allen)
- Clarke, D. J.
- Clarke, Daniel A.
- Clarke, Daniel Allen,
- Clarke, Daniel E
- Clarke, Dave.
- Clarke, David
- Clarke, David A.
- Clarke, Douglas
- Clarke, E J
- Clarke, E. de C. (Edward de Courcy), 1880-1956
- Clarke, Edward Daniel, 1769-1822
- Clarke, Edwin Leavitt, 1888-1948
- Clarke, F. E.
- Clarke, F. L.
- Clarke, Frank Wigglesworth, 1847-1931
- Clarke, Frieda M M
- Clarke, G.
- Clarke, Gary K.
- Clarke, George L. (George Leonard), 1905-1987
- Clarke, George.
- Clarke, Harry E.
- Clarke, Henry L.
- Clarke, Henry P., 1850-
- Clarke, Herbert F.
- Clarke, Hyde
- Clarke, I. C.
- Clarke, Ian.
- Clarke, Ira D. (Ira Doup), 1890-
- Clarke, J
- Clarke, J D A
- Clarke, J H
- Clarke, J R
- Clarke, J. F. Gates (John Frederick Gates), 1905-1990
- Clarke, J. Harold (Joy Harold), 1899-
- Clarke, J. Jackson (James Jackson), 1860-1940
- Clarke, J. Stirling, Mrs.
- Clarke, J. W.
- Clarke, J., of Lynton, Eng.
- Clarke, Jacob Augustus Lockhart, 1817-1880
- Clarke, Jane B
- Clarke, Jared B.
- Clarke, Jessica L.
- Clarke, John B. (John Badger), 1820-1891
- Clarke, John Mason, 1857-1925
- Clarke, John, ca 1815
- Clarke, John, 1858-
- Clarke, John, of Philadelphia.
- Clarke, John, of Philadelphia.
- Clarke, Jonathan
- Clarke, Julia A.
- Clarke, Julian H
- Clarke, K L
- Clarke, Katherine Bishop.
- Clarke, Kit.
- Clarke, L D
- Clarke, Laurence J.
- Clarke, Louisa Lane
- Clarke, M F
- Clarke, M L
- Clarke, M. J. (Michael J.)
- Clarke, Mackenzie J.
- Clarke, Malcolm R
- Clarke, Malcolm R., 1930-2013
- Clarke, Marcela
- Clarke, Margaret
- Clarke, Marguerite R.
- Clarke, Michael
- Clarke, Nickelia
- Clarke, Peggy
- Clarke, Peter
- Clarke, Peter John
- Clarke, Philip A
- Clarke, R F A
- Clarke, R. T. (Ralph T.)
- Clarke, Robert
- Clarke, Robert Henry, 1850-
- Clarke, Robin O. S.
- Clarke, Robin T., 1934-
- Clarke, Roger
- Clarke, Rohan H.
- Clarke, Rohan H. (Rohan Hartley), 1973-
- Clarke, Ronald J
- Clarke, S M
- Clarke, S R
- Clarke, S. E.
- Clarke, Samuel C.
- Clarke, Samuel F. (Samuel Fessenden), 1851-1928
- Clarke, Stephen Reynolds.
- Clarke, Stephenson R
- Clarke, Steve
- Clarke, Steve W
- Clarke, Sylvia
- Clarke, T A
- Clarke, Tayler M
- Clarke, V L R
- Clarke, W J
- Clarke, W S
- Clarke, W. B.
- Clarke, W. D.
- Clarke, W. G.,
- Clarke, Walter, 1812-1871
- Clarke, Warren T. (Warren Thompson), 1863-1929
- Clarke, Wendy E.
- Clarke, William Branwhite 1798-1878
- Clarke, William Dixon.
- Clarke, William Eagle, 1853-1938
- Clarke, William H.
- Clarke, William James, 1868-
- Clarke, Wmeagle
- Clarke-Errey, Sandy
- Clarkes (Firm : Clackamas, Or.)
- Clarke's Aquarium.
- Clarke's Seed Store.
- Clarkin, Owen
- Clark's Gramatan Gardens.
- Clark's Nurseries (Mt. Sterling, Ky.)
- Clark's Nurseries.
- Clarksburg Dahlia Gardens.
- Clarksburg Nursery Company.
- Clarksome Nurseries.
- Clarkson, Beverley
- Clarkson, Bruno
- Clarkson, E. N. K. (Euan Neilson Kerr), 1937-
- Clarkson, Edward Hale, 1866-1934
- Clarkson, F
- Clarkson, Frederick
- Clarkson, J R
- Clarkson, John
- Clarkson, John R
- Clarkson, O. Lindsay.
- Clarkson, P A
- Clarkson, Peter L.
- Clarkson, Quentin D
- Clarkson, Ralph Preston, 1886-
- Clarkson, Robert W
- Clarkson, Rosetta E.
- Clarmay Dahlia Gardens.
- Clarner, Friedrich.
- Claro Junior, Luiz Henrique
- Claro, David
- Claro, Rodolfo
- Claro-García, Alexander
- Claro-Madruga, Rodolfo
- Clarson, W
- Clarus, Johann Christian August, 1774-1854
- Clary, K
- Clary, Karen H
- Clary, Melinda L.
- Clary, R. E. (Robert Emmet), 1805-1890
- Clary, Warren P.
- Clase, Howard J.
- Clase, Teodoro
- Clasen, Lina A.
- Clasen, Lina Avila
- Clasen, Rudolf.
- Clasing, Elena, 1945-
- Clason, Alana J
- Clason, Terry.
- Class Freeman, Alexandra
- Classen Company.
- Classen, H
- Classen, Marie-Claire
- Classen, Regine
- Claßen-Bockhoff, Regine
- Classey, Eric William