The true lignum-vitae of commerce belongs to the family Zygophyllaceae, of which only three genera, namely, Guaiacum, Porlieria, and Bulnesia, have representatives of tree size, and these are confined to the tropical and sub-tropical regions of the Western Hemisphere. Porlieria is of no commerical importance.
Record, Samuel J. 1921. Lignum-vitae: A Study of the Woods of the Zygophyllaceae with Reference to the True Lignum-vitae of Commerce--Its Sources, Properties, Uses, and Substitutes. Yale School of Forestry Bulletin 6. 48 pp. + plates
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