| Paphiopedilum AuburnPaph. Auburn | | Jan 1 1945 | Cowan |
| Paphiopedilum BonitaPaph. Bonita | | Jan 1 1937 | Cowan |
| Rhyncholaeliocattleya CarlottaRlc. Carlottaintergeneric | | Jan 1 1935 | Cowan |
| Rhyncholaeliocattleya DorotheaRlc. Dorothea | | Jan 1 1934 | Cowan |
| Cattleya Augusta (2)C. Augusta (2) | | Jan 1 1933 | Cowan |
| Cymbidium PriscillaCym. Priscilla | | Jan 1 1932 | Cowan |
| Cattleya NicoletteC. Nicolette | | Jan 1 1932 | Cowan |
| Cattleya CanopusC. Canopus | | Jan 1 1932 | Cowan |
| Cattleya Estelle (1931)C. Estelle (1931) | | Jan 1 1931 | Cowan |
| Paphiopedilum RamonaPaph. Ramona | | Jan 1 1931 | Cowan |
| Oncidium Couronne d'Or (1931)Onc. Couronne d'Or (1931)primary | | Jan 1 1931 | Cowan |
| Cymbidium DelphineCym. Delphine | | Jan 1 1930 | Cowan |
| Oncidium Cora (1930)Onc. Cora (1930) | | Jan 1 1930 | Cowan |
| Rhyncholaeliocattleya MonarchRlc. Monarchintergeneric | | Jan 1 1930 | Cowan |
| Rhyncholaeliocattleya Veronica (1930)Rlc. Veronica (1930)intergeneric | | Jan 1 1930 | Cowan |
| Cattleya MignonC. Mignon | | Jan 1 1930 | Cowan |
| Rhyncattleanthe BlanchetteRth. Blanchetteintergeneric | | Jan 1 1929 | Cowan |
| Cattleya BlanchetteC. Blanchette | | Jan 1 1929 | Cowan |
| Cattleya TitymomaC. Titymoma | | Jan 1 1929 | Cowan |
| Rhyncholaeliocattleya PonticusRlc. Ponticusintergeneric | | Jan 1 1928 | Cowan |
| Cymbidium HilaryCym. Hilary | | Jan 1 1928 | Cowan |
| Rhyncholaeliocattleya Orion (1928)Rlc. Orion (1928)intergeneric | | Jan 1 1928 | Cowan |
| Rhyncholaeliocattleya HestiaRlc. Hestiaintergeneric | | Jan 1 1928 | Cowan |
| Cattleya GlorietteC. Gloriette | | Jan 1 1928 | Cowan |
| Paphiopedilum RegulusPaph. Regulus | | Jan 1 1928 | Cowan |
| Oncidium AgathaOnc. Agatha | | Jan 1 1928 | Cowan |
| Cattleya AgentaC. Agenta | | Jan 1 1928 | Cowan |
| Paphiopedilum PonticusPaph. Ponticus | | Jan 1 1927 | Cowan |
| Oncidium AmitaOnc. Amita | | Jan 1 1927 | Cowan |
| Cattleya Camilla (1927)C. Camilla (1927) | | Jan 1 1927 | Cowan |
| Cymbidium EstelleCym. Estelle | | Jan 1 1927 | Cowan |
| Oncidium EstelleOnc. Estelle | | Jan 1 1927 | Cowan |
| Cattleya HilaryC. Hilary | | Jan 1 1927 | Cowan |
| Oncidium MonaOnc. Mona | | Jan 1 1927 | Cowan |
| Cymbidium ChloeCym. Chloe | | Jan 1 1927 | Cowan |
| Cattleya CanberraC. Canberra | | Jan 1 1927 | Cowan |
| Paphiopedilum OctaviusPaph. Octavius | | Jan 1 1927 | Cowan |
| Cattleya Leander (1927)C. Leander (1927) | | Jan 1 1927 | Cowan |
| Paphiopedilum MonaPaph. Mona | | Jan 1 1926 | Cowan |
| Cattleya Althea (1926)C. Althea (1926) | | Jan 1 1926 | Cowan |
| Paphiopedilum PhillidaPaph. Phillida | | Jan 1 1926 | Cowan |
| Cymbidium MargaretCym. Margaret | | Jan 1 1926 | Cowan |
| Cattlianthe CeciliaCtt. Ceciliaintergeneric | | Jan 1 1926 | Cowan |
| Cattleya Pamela (1926)C. Pamela (1926) | | Jan 1 1926 | Cowan |
| Oncidium MonicaOnc. Monica | | Jan 1 1926 | Cowan |
| Oncidium ProteusOnc. Proteus | | Jan 1 1926 | Cowan |
| Oncidium Stanley BaldwinOnc. Stanley Baldwin | | Jan 1 1926 | Cowan |
| Cymbidium PhillidaCym. Phillida | | Jan 1 1926 | Cowan |
| Cattleya PriscillaC. Priscilla | | Jan 1 1926 | Cowan |
| Paphiopedilum MastiffPaph. Mastiff | | Jan 1 1926 | Cowan |
| Paphiopedilum Nora (1926)Paph. Nora (1926) | | Jan 1 1926 | Cowan |
| Oncidium SouthgatenseOnc. Southgatense | | Jan 1 1926 | Cowan |
| Rhyncholaeliocattleya MonaRlc. Monaintergeneric | | Jan 1 1925 | Cowan |
| Paphiopedilum MimosaPaph. Mimosa | | Jan 1 1925 | Cowan |
| Cymbidium CamillaCym. Camilla | | Jan 1 1925 | Cowan |
| Cattleya Monica (1925)C. Monica (1925) | | Jan 1 1925 | Cowan |
| Paphiopedilum ChloePaph. Chloe | | Jan 1 1925 | Cowan |
| Rhyncholaeliocattleya LunaRlc. Lunaintergeneric | | Jan 1 1925 | Cowan |
| Cattleya Sunshine (1925)C. Sunshine (1925) | | Jan 1 1925 | Cowan |
| Rhyncholaeliocattleya NoraRlc. Noraintergeneric | | Jan 1 1925 | Cowan |
| Cattleya Rhoda (1925)C. Rhoda (1925) | | Jan 1 1925 | Cowan |
| Cattleya NatalieC. Natalie | | Jan 1 1925 | Cowan |
| Cattleya Sunstar (1924)C. Sunstar (1924) | | Nov 1 1924 | Cowan |
| Oncidium MonarchOnc. Monarch | | Jan 1 1924 | Cowan |
| Cattleya Vesta (1924)C. Vesta (1924) | | Jan 1 1924 | Cowan |
| Cattleya Pandora (1924)C. Pandora (1924) | | Jan 1 1924 | Cowan |
| Cattleya Mona (1924)C. Mona (1924) | | Jan 1 1924 | Cowan |
| Oncidium MargaritaOnc. Margarita | | Jan 1 1924 | Cowan |
| Cymbidium MonaCym. Monaprimary | | Jan 1 1924 | Cowan |
| Cattlianthe DaedalusCtt. Daedalusintergeneric | | Dec 1 1923 | Cowan |
| Laeliocattleya Mrs. ChandlerLc. Mrs. Chandlerprimary | | Dec 1 1923 | O/U |
| Cattleya Phoebe (1923)C. Phoebe (1923) | | Dec 1 1923 | Cowan |
| Paphiopedilum CharlestoniiPaph. Charlestonii | | Dec 1 1923 | Cowan |
| Paphiopedilum HarrettianumPaph. Harrettianum | | Dec 1 1923 | Cowan |
| Cattleya NanonC. Nanon | | Sep 1 1923 | Cowan |
| Oncidium NanonOnc. Nanon | | Jul 1 1923 | Cowan |
| Oncidium MurilloOnc. Murillo | | Jul 1 1923 | Cowan |
| Cyrtocidium AdelaideCtd. Adelaideintergeneric | | Jul 1 1923 | Cowan |
| Cattleya Linda (1923)C. Linda (1923) | | Jan 1 1923 | Cowan |
| Cattleya Nora (1923)C. Nora (1923) | | Jan 1 1923 | Cowan |
| Cattleya Murillo (1923)C. Murillo (1923) | | Jan 1 1923 | Cowan |
| Oncidium MurielOnc. Muriel | | Jan 1 1923 | Cowan |
| Paphiopedilum ClytemnestraPaph. Clytemnestra | | Jan 1 1923 | Cowan |
| Oncidium J. H. KnightOnc. J. H. Knight | | Jan 1 1923 | Cowan |
| Cymbidium MurielCym. Muriel | | Jan 1 1923 | Cowan |
| Paphiopedilum FusilierPaph. Fusilier | | Dec 1 1922 | O/U |
| Paphiopedilum AquilaPaph. Aquila | | Jan 1 1922 | Cowan |
| Cattleya LitanaC. Litana | | Jan 1 1922 | Cowan |
| Paphiopedilum PleuronPaph. Pleuron | | Jan 1 1922 | Cowan |
| Paphiopedilum AdaPaph. Ada | | Jan 1 1922 | Cowan |
| Cattleya TamarC. Tamar | | Jan 1 1922 | Cowan |
| Cattleya DodonaC. Dodona | | Jan 1 1922 | Cowan |
| Paphiopedilum OphisPaph. Ophis | | Jan 1 1922 | Cowan |
| Cattleya SalaraC. Salara | | Jan 1 1922 | Cowan |
| Oncidium LauraOnc. Laura | | Jun 24 1920 | Cowan |
| Cattleya HoughtoniiC. Houghtoniiprimary | | Nov 25 1916 | Cowan |
| Paphiopedilum Imperator (1903)Paph. Imperator (1903)primary | | Jan 1 1903 | Cowan |