Family : Compositae
Text © Eugenio Zanotti
English translation by Mario Beltramini
The genus Arnica includes some thirty perennial herbaceous species, with circumboreal distribution and mountainous (subalpine), especially of the temperate regions of western North America.
Two species are native to Eurasia (Arnica montana and Arnica angustifolia).
The name of the genus “arnica” is thought to be a corruption of “ptàrmica”, derived from the Greek “ptarmikos”, meaning to sneeze, as the pulverized dried plant causes the sneezing and was employed for such reason by the countrymen of the mountainous regions of North Europe and of France (here it was yore known as “tabac des Vosges” and smoked like the tobacco). After others, the name is associated to the Greek words “arna”, lamb and “arnakis”, lambskin, due to the morbid hairy leaves crossed by delicate nervations, rendering them similar to it.
The name of the species, from the Latin “montanus” = mountainous, of the mountain, reminds us that it is an orophyte.
The Arnica montana L. (1753) is a perennial herbaceous plant with oblique rhizome, truncated, brown-reddish, with unpleasant smell; erect stem (10) 20-50 (60) cm, rigid, simple or not, one-two pairs of opposite branches, villous-glandular due to simple, elongated, patent hairs and short glandular hairs.
Sessile or briefly petiolate leaves, 3-5 (7) -nerved, pubescent up and almost glabrous below, entire or denticulate, the radical ones arranged in cross, in rosette, spatulate (2-4 x 10-15 cm); opposite cauline leaves, smaller, lanceolate or bractiform.
Big floral capitulum (diam. 6-8 cm), unique, or one per each branch, with villous-glandulous involucre, diam. 1-1,5 x 1,5-2 cm with a series of linear-lanceolate scales and minor external squamules. Dark yellow or yellow-orange flowers, the outer ones with 0,5 x 4 cm, tridentate, ligula; the inner ones are tubulous.
It blooms from June to August. Brown-blackish (6 mm) cylindrical achenes, wrinkly, pubescent, equipped with pappus of uniseriate bristles, grey-yellowish (6 mm). It grows in the pastures, in the arid meadows, rhododendrons moors, on acidic soil from 500 to 200 (2650) m of altitude (in some locations it is reported also in plain).Its distribution is Central-European orophyte (Alps, Jura, Carpathians and some more southerly mountain ranges). In south-western France and in southern Portugal is reported the subsp. atlantica A.Bolòs (1948). In the Arctic North Europe, besides the nominal species, is diffused also the species angustifolia, calcicola.
The arnica is a protected species in many nations and therefore for the supplying is amply cultivated worldwide; its multiplication takes place by seed or by division of the tufts; it is one of the extremely few officinal Compositae having opposite leaves instead of alternate.
The rhizome, harvested in September, but much more utilized are the capitula collected preferably by the beginning of the blooming; these contain arnicin (with action similar to that of the camphor), arnisterin, cytisine, helenalin, dihydrohelenalin, a bitter substance, an essential oil containing thymol, thymol esters and free fatty acids (acetic, isobutyric, isovaleric, lauric, palmitic, methacrylic and tiglic), glyceric ethers of the lauric and palmitic acids, n-alkanes, pseudoguaianolidide sesquipertene lactones, hydroxycoumarin, caffeic acids and derivates, carotenoids, flavonoids (isoquercetin, astragalin, luteolin-7-glucoside), umbelliferone, scopoletin, polysaccharides, the colouring substance arnizine, tannins, resins and mineral salts.
The dried capitula (Flos arnicae) have a characteristic aromatic smell, spicy, and bitter and sour taste. The rhizome, well cleaned from the land and from the roots and washed, and the flowers are to be spread to dry in the shade in aerated locations, after that are to be conserved in tin pots, glass or ceramic in dry places sheltered from the light. Before harvesting the flowers it is good to check that they are not infested by the black larvae of the “arnica fly” (Trypeta arnicivora), a parasite that renders the product unusable.
The arnica has anti-asthmatic, antineuralgic, antispasmodic, astringent, broncho-sedative, excitant of the nervous system and cardiovascular-neurotonic. The family use is only the external one, due to the toxicity in case of wrong dosage; the internal use, reserved to physicians. Presently the preparations based on arnica are mainly employed externally as anti-ecchymotic, revulsive and astringent. It is under study also for the positive action on the coronary artery diseases, antibacterial, fungicidal and antitumoural.External use preparations:
Oil of Arnica
One part of exsiccated capitula with five parts of olive oil. To be employed, only for a few days and on not injured skin, to resolve bruises, sprains, muscular and joint pains, furunculosis, subcutaneous edemata, phlebitis and thrombophlebitis, phlogosis of the oral mucosae, etc., starting with small dosages because, especially on the delicate skin of women and children and in some sensitive subjects it may cause dermatitis.
2 grams of flowers in 100 ml of water in bain-marie for 20 minutes.
Sinonimi: Arnica montana L. var. alpina (L.) 1753; Doronicum montanum (L.) Lam. (1786); Arnica montana L. var. fulgens (Pursh) Nutt. (1818); Arnica montana L. var. angustifolia (Vahl) Hook (1834); Arnica montana L. var. alternifolia Cariot & St-Lager (1889); Arnica montana L. subsp. atlantica A.Bolòs (1948); Arnica montana var. atlantica (A.Bolòs) B.Bock (2012).