Nodding Arnica: Arnica cernua -
Chamisso Arnica, Leafy Arnica, Leafy Leapordbane, Meadow Arnica, Narrowleaf Arnica, Silvery Arnica: Arnica chamissonis (Synonyms: Arnica chamissonis ssp. foliosa, Arnica chamissonis ssp. incana, Arnica chamissonis var. foliosa, Arnica chamissonis var. incana, Arnica chamissonis var. interior, Arnica chamissonis var. maguirei) -
Heartleaf Arnica, Heart-leaf Arnica, Heart-leaf Leopardbane: Arnica cordifolia (Synonyms: Arnica cordifolia var. cordifolia, Arnica cordifolia var. pumila) -
Rayless Arnica, Rayless Leopardbane: Arnica discoidea (Synonyms: Arnica discoidea var. eradiata, Arnica grayi, Arnica parviflora, Arnica parviflora ssp. alata, Arnica parviflora ssp. parviflora) - No ray flowers are present. Buds not nodding.
Foothill Arnica, Hillside Arnica, Orange Arnica, Shining Leopardbane: Arnica fulgens -
Slender Arnica, Slender Leopardbane, Small-head Arnica: Arnica gracilis (Synonym: Arnica latifolia var. gracilis) -
Clasping Arnica, Columbia Gorge Arnica, Streambank Arnica, Streambank Leopardbane: Arnica lanceolata ssp. prima (Synonyms: Arnica amplexicaulis, Arnica amplexicaulis ssp. amplexicaulis, Arnica amplexicaulis ssp. genuina, Arnica amplexicaulis ssp. prima, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexicaulis var. prima, Arnica amplexifolia ssp. prima, Arnica lanceolata, Arnica lanceolata ssp. prima, Arnica mollis var. aspera) -
Broad-leaf Arnica, Broad-leaved Arnica, Daffodil Leopardbane, Longleaf Arnica, Mountain Arnica, Spearleaf Arnica, Seep Spring Arnica, Spear-leaf Leopardbane: Arnica latifolia (Synonym: Arnica latifolia var. latifolia) -
Longleaf Arnica, Seep Spring Arnica, Spearleaf Arnica, Spear-leaf Arnica, Spear-leaf Leopardbane: Arnica longifolia (Synonyms: Arnica longifolia ssp. myriadenia, Arnica 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 (Synonyma: Arnica diversifolia, Arnica xdiversifolia) -
Nodding Arnica, Parry's Arnica: Arnica parryi (Synonyms: Arnica angustifolia ssp. eradiata, Arnica parryi ssp. parryi, Arnica parryi ssp. parryi, Arnica parryi ssp. sonnei, Arnica parryi var. parryi, Arnica parryi var. sonnei) -
Rydberg's Arnica, Subalpine Arnica, Subalpine Leopardbane: Arnica rydbergii (Synonyms: Arnica aurantiaca, Arnica cascadensis) -
Bunch Arnica, Twin Arnica, Twin Leopardbane: Arnica sororia (Synonym: Arnica fulgens var. sororia) -
Spatulate Arnica, Klamath Arnica: Arnica spathulata (Synonyms: Arnica spathulata ssp. eastwoodiae, Arnica spathulata ssp. spathulata) -
Shasta Arnica: Arnica viscosa -