Arnica

Arnica (English pronunciation: /ˈɑrnɨkə/) is a genus with about 30 perennial, herbaceous species, belonging to the sunflower family (Asteraceae). The genus name Arnica may be derived from the Greek arna, "lamb", in reference to the soft, hairy leaves.

This circumboreal and montane (sub-alpine) genus occurs mostly in the temperate regions of western North America, while two are native to Eurasia (A. angustifolia and A. montana).

Arnica used to be included in the tribe Senecioneae, because it has a flower or pappus of fine bristles. This was soon questioned and Nordenstam (1977) placed it tentatively in tribe Heliantheae s.l. This arrangement also became uncertain because of the sesquiterpene lactone chemistry in certain species. Lately Arnica was placed in an unresolved clade together with Madiinae, Eupatorieae, Heliantheae s.s. and Pectidinae.

Several species, such as Arnica montana and Arnica chamissonis, contain helenalin, a sesquiterpene lactone that is a major ingredient in anti-inflammatory preparations (used mostly for bruises).

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