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Guaiacum sanctum was created in 1753.
Guaiacum angustifolium was created in 1848.
Guaiacum officinale was created in 1753.
Most likely either Guaiacum officinale or Guaiacum sanctum. Both are small, slow-growing trees which can be used to produce lignum vitae, and are listed as endangered species.
The name would be Guaiacum officinale. Family: Zygophyllaceae.