- C & E Nursery,
- C & O Nursery.
- C. & A. Ducrettet (Firm).
- C. & A. Warren (Firm)
- C. & C. Vandenberg (Firm)
- C. A. Boone (Firm)
- C. A. Little (Firm)
- C. A. Ludlow & Son.
- C. A. Melcher (Firm)
- C. Aguiar, Francisca
- C. and J. Adlard,
- C. B. Whitnall & Co.
- C. Betscher (Firm)
- C. Brigham Co.
- C. C. Hallinan (Firm)
- C. C. Terbush (Firm)
- C. C. Welty (Firm)
- C. E. Allen (Firm)
- C. E. Whitten (Firm)
- C. Eaden Lilley (Firm)
- C. Ed Sweeney,
- C. F. Bertanzel (Firm)
- C. F. Dallman (Firm)
- C. F. Leach (Firm)
- C. Forkert (Firm)
- C. Franz & Sons.
- C. G. Velie & Son.
- C. H. & G. J. Melk (Firm),
- C. H. Brewer (Firm)
- C. H. Joosten (Firm)
- C. H. Murphey's Sons.
- C. H. Smith (Firm)
- C. Henry, Shasta
- C. Herbert Coy Seed Company.
- C. Hoffmann'Sche Verlagshandlung
- C. Hoogendoorn (Nursery)
- C. J. Clay, M. A., and Sons,
- C. J. Martin (Firm)
- C. J. Martin and Sons.
- C. Keur & Sons.
- C. L. Shell (Firm)
- C. L. Van Dusen (Firm)
- C. L. Vanderbrook (Firm)
- C. L. Yates (Firm)
- C. M. Niuffer (Firm)
- C. M. Oudyk and Company.
- C. M. Woolf & Co. Inc.
- C. Mercier and Co.
- C. Mitzky & Co.
- C. N. Fitts and Sons.
- C. P. Bailey & Sons Company
- C. P. Rose & Co.
- C. R. & N. Overman (Firm).
- C. R. Bishop (Firm)
- C. R. Graybeal and Sons.
- C. R. Tuttle (Firm)
- C. Raoux (Firm)
- C. Reagles & Son.
- C. Regenhardt's Agency.
- C. Ribsam & Son.
- C. S. Perdue (Firm)
- C. S. Pratt (Firm)
- C. S. Sheldon (Firm)
- C. Secrist (Firm),
- C. Sherman & Son
- C. Starke & Co. Ltd.
- C. Strauss & Co.
- C. Susemihl & Sohn
- C. T. Mallinckrodt & Son.
- C. U. Liggit (Firm)
- C. W. Atwater & Son.
- C. W. Eichling (Firm)
- C. W. Henderson (Firm)
- C. W. McNair Nurseries.
- C. W. Minson (Firm)
- C. West, Rick
- C. Wiley & Co.,
- C. Wilson'S Nursery,
- C. Young & Sons' Co.
- C. Young & Sons Seed and Plant Co.
- C., D. A. V.
- C., E D
- C., E. R.
- C., H H
- C., P Lozano
- C.A. Brazee (Firm)
- C.A. Conover & Son.
- C.A. Jackson's Nursery Gardens.
- C.A. Reeser Company.
- C.A. Scott (Firm),
- C.A. Stoughton Vineyard,
- C.A. Yancey & Sons.
- C.A. Yancey (Firm)
- C.A.B. International. Bureau of Crop Protection
- C.A.B. International. Institute of Entomology
- C.B. Murray (Firm)
- C.B. Teegardin & Sons
- C.C. Breece (Nursery)
- C.C. Hoy (Firm)
- C.C. Hoy Co.
- C.C. Langdon & Co.
- C.C. Morse & Co.
- C.C. Piper (Firm)
- C.C. Pollworth Company.
- C.C. Stone (Firm)
- C.C. Thayer (Firm)
- C.C. Vale (Firm)
- C.D. Garver (Firm),
- C.D. Wenger (Firm)
- C.E. Allen (Firm)
- C.E. Chapman (Firm)
- C.E. Cravens (Firm)
- C.E. DePuy Company.
- C.E. Dysinger Nursery.
- C.E. Field (Firm)
- C.E. Field Plant Farm.
- C.E. Garrahan (Firm)
- C.E. Moyer Nurseries.
- C.E. Thomas Nurseries.
- C.E. Whitten (Firm)
- C.E. Whitten's Nurseries.
- C.E. Whitten's Nursery.
- C.E. Wilson & Co.
- C.E. Wilson & Co., Inc. Berlin, Maryland Plant.
- C.E. Wilson Nurseries.
- C.F. and D.J. Kuhn (Firm),
- C.F. Barber & Co.
- C.F. Lansing (Firm)
- C.F. MacNair & Company.
- C.F. Wassenburg (Firm)
- C.G. Patten & Son.
- C.G. Patten (Firm)
- C.G. Simon Nursery,
- C.G. van Tubergen Ltd.
- C.G. Velie & Son.
- C.H. Doty (Firm)
- C.H. Goodacre (Firm)
- C.H. Hall (Firm)
- C.H. Hurlburt and Son.
- C.H. Joosten (Firm)
- C.H. Lippincott (Firm)
- C.H. Manning's Sons.
- C.H. Moir (Firm)
- C.H. Smith (Firm)
- C.H. Sommer's Gladiolus Gardens.
- C.H. Steelman Fruit Nursery,
- C.H. Stocking (Firm)
- C.H.W. Weber (Firm)
- C.I. Hunt (Firm)
- C.J. Goodman (Firm)
- C.J. Pennock (Firm)
- C.J.G. & F. Rivington,
- C.K. Sober Nurseries.
- C.L. Allen & Co.
- C.L. Allen (Firm)
- C.L. Allen (Floral Park, NY)
- C.L. Berger & Sons (Boston, Mass.)
- C.L. Lord Nursery,
- C.L. Milne (Firm)
- C.L. Pearson & Son.
- C.L. Shride (Firm),
- C.L. Van Inwagen (Firm)
- C.L. Vanderbrook & Son.
- C.M. Griffing & Co.
- C.M. Grossman (Firm)
- C.M. Grossman Estate.
- C.M. Grossman Evergreen Farm.
- C.M. Harrison (Firm)
- C.M. Hildesheim (Firm)
- C.M. Hobbs & Sons.
- C.M. Hooker & Sons.
- C.M. Hurlburt (Firm)
- C.M. Hurlburt and Son.
- C.M. Kilian (Firm),
- C.M. Marsh (Firm)
- C.M. Saxton & Co.,
- C.M. Silva & Son's Nurseries.
- C.M. Woolf & Co. Inc.
- C.N. Fitts & Son.
- C.N. Fitts and Sons.
- C.N. Flansburgh & Son.
- C.N. Flansburgh (Firm)
- C.N. Robinson & Bro.
- C.N. Sandahl (Firm)
- C.N. Wettengel (Firm)
- C.R. Burr & Company.
- C.R. Hardy (Firm)
- C.R. Hills (Firm)
- C.R. Hinkle (Firm)
- C.S. Brent Seed Co.
- C.S. Clark & Son.
- C.S. Clark & Sons.
- C.S. Curtice Company.
- C.S. Harrison's Select Nursery.
- C.S. McTavish (Firm)
- C.S. Pratt & Co.
- C.S. Pratt (Firm)
- C.S. Pratt's Nursery.
- C.S. Quick (Firm)
- C.S. Webster (Firm)
- C.U. Liggit (Firm)
- C.U. Liggit, Inc.
- C.V. Norris & Sons.
- C.V. Nurseries (Blackwell, Okla.)
- C.W. Atwater & Son.
- C.W. Brown (Firm)
- C.W. Burnett (Firm)
- C.W. Eichling (Firm)
- C.W. Grant (Firm)
- C.W. Harrold & Son.
- C.W. McGhee (Firm)
- C.W. Minson (Firm)
- C.W. Morey (Firm)
- C.W. Sampson (Firm)
- C.W. Stuart & Co.
- C.W. Stuart & Company.
- C.W. Ward (Firm)
- Caamaño, D. V.
- Caamaño, Diego
- Caba, Mario
- Cabactulan, Derek
- Caballé, Guy
- Caballer Gutiérrez, Manuel
- Caballero Martínez, Luis Antonio
- Caballero McGuire, Ana Maria
- Caballero Nieto, Javier, 1950-2020
- Caballero Ochoa, Andrea Alejandra
- Caballero R., Guillermina
- Caballero y Bellido, Ernesto
- Caballero y Caballero, Eduardo, 1904-1974
- Caballero y Segares, Arturo
- Caballero y Villaldea, Sergio
- Caballero, Cecilia
- Caballero, Paula P.
- Caballero, Susana
- Caballero, Williams
- Caballero-Vázquez, José Adán
- Caballus, Franciscus, -1540
- Cabanac, Arnaud J.
- Cabañas Vargas, Dulce Diana
- Cabanès, G
- Cabanillas, Marcos
- Cabanillas, Pablo A.
- Cabanis, Dr Jean
- Cabanis, Jean Louis, 1816-1906
- Cabarcas-Mier, Angélica
- Cabarroi-Hernández, Milay
- Cabas, Patricia
- Cabeceira, Fernando G.
- Cabell, E. C. (Edward Carrington), 1816-1896