| Name | Guajacum sanctum f. angustifolia Engler |
| Authorship | Engler |
| Rank | Forma |
| NomenclaturalStatus | NomLeg |
| Placed in | Guajacum sanctum Linnaeus |
| Citation | 1903 Bull. Herb. Boissier ser. 2, 3: 96 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Guajacum sanctum f. angustifolia Engler |
| Identification made in | [no date] (1), 1963 (1) |
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