<P> Arnica / ˈɑːrnɪkə / is a genus of perennial, herbaceous plants in the sunflower family (Asteraceae). The genus name Arnica may be derived from the Greek arni, "lamb", in reference to the plants' soft, hairy leaves . Arnica is also known by the names mountain tobacco and, confusingly, leopard's bane and wolfsbane--two names that it shares with the entirely unrelated genus Aconitum . </P> <P> This Circumboreal and montane (subalpine) genus occurs mostly in the temperate regions of western North America, with a few species native to the Arctic regions of northern Eurasia and North America . </P> <P> Several species, such as Arnica montana and A. chamissonis, contain helenalin, a sesquiterpene lactone that is a major ingredient in anti-inflammatory preparations (used mostly for bruises). </P> <P> Arnica species are used as food plants by the larvae of some Lepidoptera species including Bucculatrix arnicella . </P>

Bruise treating arnica comes from what type of plant
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