Arnica sanhedrensis

Arnica sanhedrensis Rydberg, sp. nov
Rootstock short, branched; stems slender, 3-5 dm. high, villous, sulcate; basal leaves, lower stem-leaves, and leaves of the offsets long-petioled, the petioles 5-8 cm. long, villous; leaf-blades cordate, acute, 5-9 cm. long, 4-S cm. wide, sharply, coarsely, and usually doubly dentate, thin, sparingly villous on both sides; stem-leaves about 3 pairs, the upper ones ovate, dentate, with broadly winged petioles, the leaves of the inflorescence reduced, lanceolate, and sessile; heads 4—18; involucre turbinate-campanulate, 10-12 mm. high, about 15 mm. broad; bracts lance-oblong, acute, villous; ray-flowers wanting ; disk-corollas 7-8 mm. long; achenes 7 mm. long, sparingly hirsute and slightly granuliferous; pappus-bristles white, 6-7 mm. long, barbellate. (Irregularly lobed ligules, 8 mm. long, 3—4 mm. wide, are very rarely found.)
Type collected south of Mt. Sanhedrin, Lake County, California, July 25, 1902, Heller 5985 (herb. N. Y. Bot. Gard.).
Distribution: From Lake to Trinity County, California, in the foothills.