| Cattleya Mary L. ZimmermanC. Mary L. Zimmerman | | Jan 1 1956 | Siegwart |
| Cattleya Emily Davies NyceC. Emily Davies Nyce | | Jan 1 1956 | Siegwart |
| Cattleya Gina LollobrigidaC. Gina Lollobrigida | | Jan 1 1956 | Siegwart |
| Cattleya BaltimoreC. Baltimore | | Jan 1 1954 | Siegwart |
| Paphiopedilum Lorena GorePaph. Lorena Gore | | Jan 1 1953 | Siegwart |
| Rhyncholaeliocattleya HelvetiaRlc. Helvetia | | Jan 1 1952 | Siegwart |
| Rhyncholaeliocattleya Neva MeadRlc. Neva Meadintergeneric | | Jan 1 1952 | Siegwart |
| Cattleya George PocockC. George Pocock | | Jan 1 1952 | Siegwart |
| Rhyncholaeliocattleya Ernest N. CoryRlc. Ernest N. Coryintergeneric | | Jan 1 1952 | Siegwart |
| Cattleya KreszentiaC. Kreszentia | | Jan 1 1952 | Siegwart |
| Cattleya AmabonysiusC. Amabonysius | | Jan 1 1952 | Siegwart |
| Rhyncholaeliocattleya Free StateRlc. Free State | | Jan 1 1952 | Siegwart |
| Rhyncattleanthe Golden CharmRth. Golden Charmintergeneric | | Jan 1 1952 | Siegwart |
| Cattleya AnnapolisC. Annapolis | | Jan 1 1952 | Siegwart |
| Cattleya Ethel SavageC. Ethel Savage | | Jan 1 1952 | Siegwart |
| Cattleya Hans W. IrelandC. Hans W. Ireland | | Jan 1 1952 | Siegwart |
| Cattleya B. B. StarkeyC. B. B. Starkey | | Jan 1 1952 | Siegwart |
| Rhyncholaeliocattleya Doctor Sterling V. MeadRlc. Doctor Sterling V. Meadintergeneric | | Jan 1 1950 | Siegwart |
| Paphiopedilum Governor Robert GorePaph. Governor Robert Gore | | Jan 1 1942 | Siegwart |
| Cymbidium Charles SiegwartCym. Charles Siegwart | | Jan 1 1937 | Siegwart |
| Cattleya JuanitaC. Juanita | | Jan 1 1937 | Siegwart |
| Cattleya Chloris McKinleyC. Chloris McKinley | | Jan 1 1937 | Siegwart |
| Cattleya Chadd's FordC. Chadd's Ford | | Jan 1 1937 | Siegwart |
| Cattleya LumastianaC. Lumastiana | | Jan 1 1937 | Siegwart |
| Cattleya John KuhnC. John Kuhn | | Jan 1 1937 | Siegwart |
| Cymbidium Lord BaltimoreCym. Lord Baltimore | | Jan 1 1937 | Siegwart |