(IB) 'Obadiah' 1926, Burchfield 'Obadiah' (Samuel Burchfield, R. 1926. IB Early bloom. Color Class S4L. Burchfield 1926; Schreiner 1928. See below: * Referen...
(IB) 'October Clouds' 1957, Brown 'October Clouds' (G. Percy Brown, R. 1957) IB, 28" (71 cm). Fall bloom. Standards medium blue; falls shade darker, slight haft m...
(IB) 'October Opera' 1932, Sass 'October Opera' (Hans Peter Sass, 1932). IB, Midseason bloom and rebloom. Color Class S9D. Note: Although originally registered as...
■(IB) 'October Storm' 2002, Sutton 'October Storm' (George Sutton, R. 2001). Seedling #G 86 1 M SA RE. IB, 26" (66 cm), Early to midseason bloom and reblooming. S...
(IB) 'Oddfellow' 1956, Muhlestein 'Oddfellow' (Tell Muhlestein, R. 1956). Seedling #52 l1. IT (hybrid), 20" (51 cm). Early midseason bloom. Color Class W2, Fancy ...
(IB) 'Odin' 1901, Caparne 'Odin' (William J Caparne, 1901) IB. Early bloom. Color Class W1. See below: * * References References: From Treholme Gardens c...
(IB) 'Olive White' 1932, Sass 'Olive White' (Hans Peter Sass, R. 1936) IB. Early bloom and rebloom. Color Class W4. Slight fragrance. Nursery listings: Toedt 1932...
(IB) 'Olivine' 1934, Danenhauer 'Olivine' (H. L. Danenhauer, R. 1934) IB. Very late bloom. Color Class S1M. 'Mrs. Horace Darwin' x unknown. Main.BobPries 2...
■(IB) 'On Golden Pond' 1998, Dyer 'On Golden Pond' (Perry Dyer, R. 1998). Seedling #94 77A. IB, 18" (46 cm), Late midseason bloom. Full golden yellow self; beards...
■(IB) 'On The Short LIst' 2024, Toth 'On The Short List' (David Toth, R. 2024). Seedling 23 12i, IB, 17" (43 cm), Early bloom. Standards golden yellow; style arms...
■(IB) 'Oodles' 2003, Miller 'Oodles' (Lynda Miller, R. 2003). Seedling #2397B. IB, 24" (61 cm), Late midseason bloom. Standards purple to red violet; falls full p...
(IB) 'Opalescent' 1934, Gersdorff 'Opalescent' (Charles Gersdorff, R. 1934) IB. Midseason bloom. Color Class Y9L. 'Mrs. S. Cuthbertson' x 'Ch'enyaun'. Main.B...
(IB) 'Opéra' 1916, Vilmorin 'Opéra' (Vilmorin Andrieux et Cie, R. 1916) IB. Midseason bloom. Color Class S9D. See below: * References References Journal de...
(IB) 'Ophir Gold' 1935, Andrews 'Ophir Gold' (Darwin Andrews, R. 1935) IB. Late midseason bloom. Color Class Y4M. See below: * * References References: F...
(IB) 'Orange And Rose' 1934, Denenhauer 'Orange and Rose' (H. L. Danenhauer, R. 1934) IB. Midseason bloom. Color Class S6L. 'Naiad Atlanta' x 'Gobelin Red'. ...
■(IB) 'Orca' 2005, Smith 'Orca' (Marky Smith, R. 2005). Seedling #02 28D. IB, 25" (64 cm). Early midseason bloom. Standards very dark violet between (RHS 85A and ...
(IB) 'Orcagna' 1934, Dannenhauer 'Orcagna' (H. L. Danenhauer, R. 1934) IB. Midseason late bloom. Color Class S9D. 'Dalila' x 'Medrano'. Main.BobPries 2011 ...
(IB) 'Orienta' 1934, Gersdorff 'Orienta' (Charles Gersdorff, R. 1934) TB. Midseason late bloom. Color Class S6D. 'Zita' x 'Flammenschwert'. Main.BobPries 2...
(IB) 'Ortrud' 1928, Morrison 'Ortrud' (Benjamin Y. Morrison, 1928) IB. Midseason bloom. Color Class S6M. 'Alcazar' x 'Oriflamme'. See below: * * References R...
(IB) 'Osiris' 1910, Barr 'Osiris' (Barr and Sons, 1910) IB. Early bloom. Color Class B1D. Note: Not to be confused with Ar 'Osiris' by Van Tubergen vefore 1911. ...
(IB) 'Osis' Before 1902, Perry 'Osis' ( Amos Perry, before 1902) IB. Midseason bloom. Color Class B3L. See below: * * References a name="References" /a ...
(IB) 'Our Fan' 1984, Love 'Our Fan' (Frances Love, R. 1984). Seedling# BW 83/1/10. AB, 22" (56 cm), Early bloom. Standards cream; falls gold, brown area around b...
■(IB) 'Out Of Focus' 1992, Black 'Out Of Focus' (Paul Black, R. 1991). Seedling #86418A. IB, 26" (66 cm), Midseason bloom. Standards white rib, slight pale blue...
■(IB) 'Oyez' 1938, White 'Oyez' (Clarence G. White, 1938) AB (OGB diploid). IMB, medium height, midseason. White with red patterning and veining. 'Polyhymnia' X '...