Rayless Arnica (Arnica Discoidea) is a perennial herb in the Asteraceae family with easy care difficulty. It requires moderate watering and full sun or partial shade light in USDA hardiness zones 6-9. This plant is toxic to cats and dogs — keep it out of reach of pets.

Arnica discoidea, commonly known as Rayless Arnica, is a rhizomatous perennial herb native to western North America, especially California.