| Name | Cattleya rex O'Brien |
| Authorship | O'Brien |
| Rank | Species |
| Placed in | Cattleya |
| Citation | 1890 Veröff. Geobot. Inst. Rübel Zürich 8: 684 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Cattleya rex O'Brien |
| Identification made in | [no date] (4) |
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