| Scientific Name | Author | Family | Establishment Status |
|---|---|---|---|
| × Fatshedera lizei | (Cochet) Guillaumin | Araliaceae | Only found in cultivation |
| × Harrisinopsis jusbertii | (Rebut ex K.Schum.) P.V.Heath | Cactaceae | Only found in cultivation |
| × Pacherocactus orcuttii | (K.Brandegee) G.D.Rowley | Cactaceae | Only found in cultivation |
