Hymenopappus petaloideus

Hymenopappus petaloideus Rydberg, sp. nov
A leafy-stemmed perennial with a branched caudex; stems floccose, terete, about 3 dm. high; leaves 5-10 cm. long, pinnatifid with linear, acute, spreading divisions, floccose on both sides; heads few, corymbose; involucre 8-9 mm. high, 10-12 mm. broad, sparingly floccose; bracts lanceolate or lance-elliptic, acute, yellow and petaloid about half their length; corollas light-yellow; tube more than 1 mm. long; throat 1.5 mm. long, campanulate, longer than the ovate lobes; achenes 4 mm. long, faintly striate, puberulent; pappus a minute crown of squamellae.
Type collected at the head of Rock Creek Canyon, Chiricahua Mountains, Arizona, Blunter 1202 (herb. N. Y. Bot. Gard.).