This article is largely based on an article in the out-of-copyright Encyclopædia Britannica Eleventh Edition, which was produced in 1911. (May 2017)
Ammoniacum or the gum ammoniac is a gum-resin exuded from the several perennial herbs in the genus Ferula of the umbel family (Apiaceae). There are three types of ammoniacum: the gums ammoniac of Cyrenaica, of Persia (the commercial one today), and of Morocco.
Ammoniac of Cyrenaica
Ammoniacum was first documented in the 1st century by Dioscorides in his De materia medica. It got its name from the Temple of Jupiter Ammon in ancient Libya (located in the Siwa Oasis of Egypt today) near which it was produced. It is called the gum ammoniac of Cyrenaica to differentiate it from the commercial one used today, and its source plant has been identified as Ferula marmarica native to Libya and Egypt. The export of the gum ammoniac of Cyrenaica to Europe declined after Arab and Turk domination of the Middle East, but probably continued at least until the 18th century, as Linnaeus still cited Libya and Egypt as the places of origin of ammoniacum in his Materia medica.
Ammoniac of Persia
The gum ammoniac of Persia gradually replaced the one of Cyrenaica as the commercial ammoniacum exported to Europe. It was probably first mentioned in European literature in 1716 by Michael Bernhard Valentini. Its source plant is Ferula ammoniacum (syn. Dorema ammoniacum) native to Iran, Turkmenistan, Afghanistan and Pakistan.
The plant grows to the height of 2½ or 3 meters (8 or 9 ft.) and its whole stem is pervaded with a milky juice, which oozes out on an incision being made at any part. This juice quickly hardens into round tears, forming the "tear ammoniacum" of commerce. "Lump ammoniacum", the other form of the substance, consists of aggregations of tears, frequently incorporating fragments of the plant itself, as well as other foreign bodies.
Ammoniacum has a faintly fetid, unpleasant odor, which becomes more distinct on heating; externally, it possesses a reddish-yellow appearance, and when the tears or lumps are freshly fractured they exhibit a waxy luster. It is chiefly collected in central Persia, and comes to the European market by way of Bombay.
Ammoniacum is closely related to asafoetida and galbanum (from which, however, it differs in yielding no umbelliferone) both in regard to the plant which yields it and its putative therapeutical effects. Internally it is used in conjunction with squills in bronchial affections.[medical citation needed] In asthma and chronic colds it is found useful,[medical citation needed] but it has no advantages over a number of other substances of more constant and active properties (Sir Thomas Richard Fraser). Only the "tear ammoniacum" is official.
Ammoniac of Morocco
The gum ammoniac of Morocco first received attention in Europe in 1809 when James Grey Jackson described a plant producing the gum ammoniac of Barbary. The source plant has been identified as Ferula communis subsp. brevifolia native to Morocco, Algeria and the Canary Islands. Though it has been used by local people as herbal medicine for hundreds of years, it probably has never been commercially important in Europe.
- Stapf, Otto (1907). "The gums ammoniac of Morocco and the Cyrenaica. (Ferula communis, L., var. brevifolia, Mariz; Ferula marmarica, Aschers. and Taub.)". Bulletin of Miscellaneous Information (Royal Botanic Gardens, Kew). 1907 (10): 375–388. doi:10.2307/4111767. ISSN 0366-4457.
- Von Linné, Carl (1787). Materia medica (5th ed.). Leipzig: Wolfgang Walther. p. 283.
- Valentini, Michael Bernhard (1716). Historia simplicium reformata: sub Musei Museorum titulo antehac in vernacula edita. Frankfurt: Officina Zunneriana Apud Johannem Adamum Jungium. p. 279.
- "Ferula ammoniacum (D.Don) Spalik, M.Panahi, Piwczynski & Puchalka". Plants of the World Online. Kew Science. Retrieved 2021-05-17.
- public domain: Chisholm, Hugh, ed. (1911). "Ammoniacum". Encyclopædia Britannica. Vol. 1 (11th ed.). Cambridge University Press. p. 863. One or more of the preceding sentences incorporates text from a publication now in the
- Jackson, James Grey (1809). An Account of the Empire of Marocco, and the District of Suse. London: W. Bulmer and Co. p. 83.
- "Ferula communis subsp. brevifolia (Link ex Schult.) Elalaoui ex Dobignard". Plants of the World Online. Kew Science. Retrieved 2021-05-17.