Arnica jonesii

Arnica jonesii Rydb. Fl. Rocky Mts. 979. 1917
Rootstock horizontal; stem 3-4 dm. high, glandular-puberulent and slightly villous, especially on the peduncles; leaves of the offsets long-petioled; blades ovate-cordate, 1-3 cm. long, sparingly villous and glandular-puberulent; stem-leaves 2 or 3 pairs, sessile, ovatecordate, 2-5 cm. long, dentate; heads 1-3, usually solitary; involucre turbinate, 10-12 mm. high and as broad, slightly villous and glandular-puberulent; bracts 12-15, linear-oblanceolate, acuminate; ray-flowers about 12, the ligules 10-13 mm. long; disk-flowers 6-6.5 mm. long; achenes 6 mm. long, glandular-puberulent, sparingly hispidulous towards the apex; pappusbristles straw-colored, barbellate, 6 mm. long.
Type locality: Not given; but the type was collected near Alta, Utah, July 31, 1879, M. E. Jones 1119 (herb. Columbia University).
Distribution: Wasatch Mountains. Utah.