Tragacanth is a gum-producing substance proposed as one possible identification of the “spicery” mentioned in Genesis. The identification is uncertain, since the same passage’s margin also gives storax as an alternative.
Tragacanth has no independently described biblical role beyond its appearance as a possible meaning of the spice or aromatic material carried by the traveling merchants in Genesis 37:25.
The identification is expressly uncertain. The translation margin offers “gum tragacanth or storax,” so tragacanth should be treated as a proposed rather than certain identification.