Perityle rosei Greenm.

Perityle rosei Greenman, Proc. Am. Acad. 40: 45. 1905
A perennial with a woody base; stem striate, puberulent, 1-2 dm. high; leaves opposite or the uppermost alternate; petioles about 1 cm. long; blades ovate-triangular or somewhat hastate, 1-3 cm. long, acute or rounded at the apex, entire or slightly sinuate, puberulent on both sides; peduncles 1-3 cm. long; involucre about 5 mm. high; bracts oblanceolate, acute, pubescent; ray-flowers 10-12; ligules white, oblong, 2 mm. long; disk-corollas about 2 mm. long; achenes oblong, about 2.5 mm. long, ciliate on the callous margins, glabrous on the faces; pappus of a crown of united erose squamellae and 2 awns nearly as long as the achene.
Type locality: Sierra Madre, west of Bolaflos, Jalisco, Mexico. Distribution: Jalisco.