ammoniacum

This juice quickly hardens into round tears, forming the "tear ammoniacum" of commerce.

Only the "tear ammoniacum" is officinal.

Ferula tingitana makes "African ammoniacum"

Dorema ammoniacum, Ferula galbaniflua, and Ferula sumbul are sources of incense.

Under the name of East Indian sumbul, the root of Dorema ammoniacum has occasionally been offered in English commerce.

It is of a browner hue, has the taste of ammoniacum, and gives a much darker tincture than the genuine drug; it is thus easily detected.

"Lump ammoniacum," the other form in which the substance is met with, consists of aggregations of tears, frequently incorporating fragments of the plant itself, as well as other foreign bodies.

Ammoniacum, or gum ammoniac, is a gum-resin exuded from the stem of a perennial herb (Dorema ammoniacum) of the umbel family (Apiaceae).

African ammoniacum is the product of a plant said to be Ferula tingitana, which grows in North Africa; it is a dark colored gum-resin, possessed of a very weak odor and a persistent acrid taste.