Helenium thurberi A. Gray

Helenium thurberi A. Gray, Proc. Am. Acad. 19: 32. 1883
Heleniastrum Thurberi Kuntze, Rev. Gen. 342. 1891.
A branched annual; stem 5-10 dm. high, puberulent, winged; lower leaves oblanceolate, 5-8 cm. long, more or less puberulent, sharply dentate; upper leaves narrowly lanceolate or linear-lanceolate, entire; heads discoid, corymbose; peduncles slender, 5-10 cm. long; involucral bracts lance-subulate, 5-7 mm. long; disk globose or slightly ovoid, 7-8 mm. broad, fuscous; corollas less than 1.5 mm. long; tube minute; throat campanulate; achenes 1 mm. long, hirsute on the angles; squamellae rounded-ovate, obtuse, one-third as long as the corolla.
Type locality: Southern Arizona. Distribution: Arizona to Chihuahua and Tepic.