Rayless Arnica, Rayless Leopardbane: Arnica discoidea (Synonyms: Arnica discoidea var. eradiata, Arnica grayi, Arnica parviflora ssp. alata, Arnica parviflora ssp. parviflora, Arnica parviflora) - Flower heads ascending to erect. Lower stem leaves ovate to heart-shaped.
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) - Flower heads nodding. Lower stem leaves lanceolate.