Galbanum is an aromatic gum resin, the prouct of certain Persian plant species, chiefly Ferula gummosa, syn. galbaniflua and Ferula rubricaulis. Galbanum-yielding plants grow plentifully on the slopes of the mountain ranges of northern Iran. It occurs usually in hard or soft, irregular, more or less translucent and shining lumps, or occasionally in separate tears, of a light-brown, yellowish or greenish-yellow colour, and has a disagreeable, bitter taste, a peculiar, somewhat musky odour, and a specific gravity of 1.212. It contains about 8% of terpene; about 65% of a resin which contains sulfur; about 20% of gum; and a very small quantity of the colourless crystalline substance umbelliferone.