Clasping Arnica, Streambank Arnica, Streambank Leopardbane: Arnica lanceolata ssp. prima (Synonyms: Arnica amplexicaulis, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexifolia ssp. prima) -
Nodding Arnica, Serpentine Arnica: Arnica cernua -
Heart-leaf Arnica, Heart-leaf Leopardbane, Heart-leaved Arnica: Arnica cordifolia (Synonyms: Arnica cordifolia var. cordifolia, Arnica cordifolia var. pumila) -
Rayless Arnica, Rayless Leopardbane: Arnica discoidea (Synonyms: Arnica grayi, Arnica parviflora ssp. alata, Arnica parviflora ssp. parviflora) - Discoid flower heads. Ray flowers are absent.
Slender Arnica, Slender Leopardbane: Arnica gracilis (Synonym: Arnica latifolia var. gracilis)
Slender Arnica, Small-head Arnica, Slender Leopardbane: Arnica gracilis (Synonym: Arnica latifolia var. gracilis) -
Broadleaf Arnica, Broad-leaved Arnica, Broad leaved Arnica, Daffodil Leopardbane, Mountain Arnica: Arnica latifolia (Synonym: Arnica latifolia var. latifolia) -
Longleaf Arnica, Seep Spring Arnica, Spear-leaf Arnica, Spear-leaf Leopardbane: Arnica longifolia (Synonym: Arnica longifolia ssp. myriadenia) -
Cordilleran Arnica, Cordilleran Leopardbane, Hairy Arnica: Arnica mollis -
Nevada Arnica, Sierra Arnica, Sierran Leopardbane: Arnica nevadensis (Synonym: Arnica tomentella) -
Sticky Arnica, Sticky-leaf Arnica: Arnica ovata (Synonyms: Arnica diversifolia, Arnica amplexicaulis, Arnica xdiversifolia) - - Note: This species is considered Arnica diversifolia in Oregon.
Nodding Arnica, Parry's Arnica: Arnica parryi (Synonyms: Arnica angustifolia ssp. eradiata, Arnica parryi ssp. parryi, Arnica parryi ssp. sonnei, Arnica parryi var. parryi, Arnica parryi var. sonnei) - Discoid flower heads. Ray flowers are absent.
Rydberg's Arnica, Subalpine Arnica, Subalpine Leopardbane: Arnica rydbergii (Synonym: Arnica aurantiaca) -
Klamath Arnica, Spatulate Arnica: Arnica spathulata (Synonyms: Arnica spathulata ssp. eastwoodii, Arnica spathulata ssp. spathulata) -