Arnica cernua is a species of arnica known by the common name serpentine arnica.Flora of North America, serpentine arnica, Arnica cernua It is native to the Klamath Mountains of northern California and southern Oregon, where it is a member of the serpentine soils flora.Biota of North America Program 2014 county distribution mapCalflora taxon report, University of California, Arnica cernua, Howell serpentine arnica
This is a perennial herb growing one or more green to purplish stems up to about 30 centimeters tall. There are 3 or 4 pairs of leaves on long petioles. The blade is oval to spade-shaped and may be several centimeters long. The inflorescence contains one or more hairy, glandular, daisylike flower heads, each with a center of yellowish disc florets and a fringe of yellow ray florets which approach 3 centimeters in maximum length.
The fruit is a cylindrical achene about 7 millimeters long which is covered in stiff hairs and has a white pappus at one end.
References
External links Jepson Manual Treatment Calphotos Photo gallery, University of California