- House Of Plants (Binghamton, N.Y.),
- House Of Spic & Span,
- House, A P N
- House, Bob,
- House, C
- House, C. A.
- House, Charles Arthur.
- House, E W
- House, Edward John, 1879-
- House, Gloria N
- House, Homer D. (Homer Doliver), 1878-1949
- House, M R
- House, Margaret
- House, Michael R
- House, Parker H
- Housefield, Grahame P
- Householder, Alston Scott, 1904-
- Householder, Ethan
- Housel, C M
- Housel, D. Florine,
- Houseman, R M
- Houser, Gilbert Logan, 1866-
- Houser, H. L.
- Houser, J S
- Houser, Jeremy D
- Houser, John S.
- Houseweart, M W
- Houseweart, Mark W
- Housman, Henry
- Housman, William.
- Houssay, Frédéric, 1860-1920
- Houssay, M
- Houssay, M. F.
- Houssaye, J.-G.
- Houssin, Céline
- Houston Neurological Society.
- Houston Orchards.
- Houston, A M
- Houston, Allan E
- Houston, B R
- Houston, Bill
- Houston, Byron D.
- Houston, C
- Houston, C Stuart
- Houston, C. Stuart
- Houston, D C
- Houston, D R
- Houston, Darryl
- Houston, David
- Houston, David C
- Houston, David Franklin, 1866-1940
- Houston, David Franklin, 1866-1940
- Houston, David R., 1932-
- Houston, Edwin J. (Edwin James), 1847-1914
- Houston, Garfield
- Houston, Heather A
- Houston, J. J.
- Houston, K J
- Houston, Martin R.
- Houston, Mary I.
- Houston, R S
- Houston, Rs
- Houston, Terry
- Houston, Terry F
- Houston, Wayne
- Houston, Wayne A.
- Houston's Nurseries.
- Houstons' Nurseries.
- Houstoun, William
- Houstoun, William, 1703-1733
- Houtcooper, Wayne C.
- Houtepen, Erik
- Houtermans, Elsa
- Houthoofdt, Robin
- Houtman, Cornelis de, 1599
- Houtman, R
- Houton, J. Reg.
- Houttuyn, Frans
- Houttuyn, Frans (Erven, Amsterdam)
- Houttuyn, M. (Martinus), 1720-1798
- Houzeau de Lehaie, J.
- Houzeau, Jean-Charles, 1820-1888
- Hovanitz, William, 1915-
- Hovde, Bjørnar
- Hovdebo, H. R.
- Hove, Alisa A
- Hove, c
- Hove, Frederick Hendrick van, 1628?-1698
- Hove, Harry A. ten
- Hove, Mark C
- Hove, Martine van
- Hovel, H
- Hovelacque, M Maurlee
- Hoveland, Carl Soren, 1927-
- Hövemeyer, K
- Hövemeyer, Klaus
- Hoven, Earl E
- Hovenden, Frederick.
- Hovenkamp, P
- Hovenkamp, P H
- Hovenkamp, Peter
- Hovermale, Ralph A.
- Hoverman Brothers.
- Hovestadt, Ad
- Hovey & Co.
- Hovey and Nichols (Firm)
- Hovey West Indies Expedition.
- Hovey, C. M. (Charles Mason), 1810-1887
- Hovey, Edmund Otis, 1862-1924
- Hovey, Kevin
- Hovey, Roy M.
- Hovey, Tim E
- Hovey, William Alfred 1841-
- Hovingh, P
- Hovingh, Peter
- Hovis, J
- Hovis, Warren A.
- Hovore, F
- Hovore, F T
- Hovore, Frank T
- Hovore, Frank T.
- Hovorka, Dirk S.
- Hovorka, Tomáลก
- Hovstad, Knut Anders
- How J., R A Dell
- How, N K
- How, R A
- How, Ric
- How, William Dunbar, active 1825-
- How, William Field
- Howald, Ann M
- Howald, Ann M.
- Howard & Morrow.
- Howard & Smith.
- Howard A. Hinman (Firm)
- Howard and Morrow.
- Howard and Smith (Firm)
- Howard Bliss (Firm)
- Howard E. Andrews & Co., Inc.
- Howard E. Gates (Firm)
- Howard Flower Gardens.
- Howard Hughes Medical Institute.
- Howard J. Burd (Firm)
- Howard Lake & Victor Nurseries, Inc.
- Howard Lake & Victor Nurseries.
- Howard Lake and Victor Nurseries, Inc.
- Howard M. Gillet (Firm)
- Howard M. Gillet (Firm),
- Howard Nursery Company.
- Howard R. Rich (Firm)
- Howard R. Rich (Reading, Pa.)
- Howard R. Watkins (Firm)
- Howard Rose Co.
- Howard Rose Company.
- Howard Seed Company (Jacksonville, Fla.)
- Howard Smith (Firm)
- Howard St. Pansy Gardens.
- Howard Strawberry Fields.
- Howard Street Pansy Gardens,
- Howard T. Munson (Firm)
- Howard Uhrig (Firm)
- Howard W. Ford Nursery.
- Howard W. Lynn (Firm),
- Howard, S R
- Howard, A B
- Howard, A D
- Howard, A G
- Howard, A. D. (Arthur Day), 1874-
- Howard, Adolph G
- Howard, Albert 1873-1947
- Howard, Alexander Liddon, 1863-1946
- Howard, Alice Q
- Howard, Allen
- Howard, Annie Elizabeth.
- Howard, Arthur David, 1906-1986
- Howard, Brett
- Howard, Burton J.
- Howard, Burton James, 1872-
- Howard, Burton James.
- Howard, C
- Howard, C W
- Howard, C. W.
- Howard, Charles Wallace, 1811-1876
- Howard, Chas.
- Howard, Christopher
- Howard, Deborah V
- Howard, E S
- Howard, Elaine
- Howard, Elizabeth
- Howard, Elizabeth S
- Howard, Elizabeth S.,
- Howard, Evelyn
- Howard, F H
- Howard, F. A.
- Howard, Faye B
- Howard, Forrest W
- Howard, Frank L
- Howard, Frank, 1805-1866
- Howard, Frank.
- Howard, G
- Howard, G W
- Howard, Gabrielle L. C.
- Howard, Gene S., 1915-
- Howard, Geoff
- Howard, George E. (George Ellsworth)
- Howard, George P.
- Howard, Grace E. (Grace Elizabeth), 1886-
- Howard, H A
- Howard, H F
- Howard, Heidi
- Howard, Heman A.
- Howard, Henry Eliot, 1873-1940
- Howard, Hildegarde 1901-1998
- Howard, Hugh Wyman.
- Howard, J. Eliot (John Eliot), 1807-1883
- Howard, James D.,
- Howard, James O.
- Howard, James,
- Howard, Jeanette
- Howard, John Galen, 1864-1931
- Howard, Kay
- Howard, L D
- Howard, L. O. (Leland Ossian), 1857-1950
- Howard, L. O.,
- Howard, Lauren F.
- Howard, Leif
- Howard, Luke, 1772-1864
- Howard, M J Eliot
- Howard, M. Maitland
- Howard, Mary Matilda,
- Howard, Max
- Howard, Nathaniel O. (Nathaniel Orson), 1880-1930
- Howard, Nathaniel Orson, 1880-
- Howard, Neale F. (Neale Frederick), 1890-
- Howard, Paul J.
- Howard, Philip
- Howard, R P
- Howard, R. J.
- Howard, Ralph W
- Howard, Richard A. (Richard Alden),
- Howard, Steve
- Howard, Thad M
- Howard, Theresa
- Howard, Theresa M.
- Howard, Thomas
- Howard, Trevor N
- Howard, Truda M
- Howard, W.
- Howard, W. L. (Walter Lafayette), 1872-
- Howard, Walter E