This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Annual; stem rather stout, glandular-pubescent and viscid above, 1°-3° high. Leaves lanceolate, entire, acute or acuminate, narrowed at the base, rough on both sides, the upper alternate, the lower opposite and slender-petioled, 2-4' long, 3"-5" wide; bracts of the involucre 10-16, linear-lanceolate or spatulate, glandular-hispid, the inner with purplish tips; ray-flowers 8-10; rays rose-purple, deeply 3-cleft, sometimes small, or none; achenes about 4" long and 1/2" thick; pappus scales of the disk-flowers 6-8, lanceolate, awned, more than half the length of the achene, those of the ray-flowers as many, spatulate, obtuse, shorter.
In dry soil, Nebraska to Colorado, Texas and Mexico. July-Sept.
S evia callosa Nutt. Journ. Acad. Phila. 2: 121. 1821.
O. tenuifolium Raf. New Fl. N. A. 4: 74. 1836.
Polypteris callosa A. Gray, Proc. Am. Acad. 19: 30. 1883.
Annual, glandular, at least above; stem slender, paniculately branched, 1°-2° high. Leaves linear, or linear-lanceolate, 1' - 2 1/2' long, 1"- 2 1/2" wide, entire, short-petioled, mostly alternate; heads discoid; bracts of the top-shaped involucre 8-10, linear or narrowly oblong, herbaceous, pubescent, about \' long, their tips reddish; corollas purple, deeply 5-parted; achenes narrowly obpyramidal, pubescent or glabrous, nearly as long as the involucre; pappus scales obovate or nearly orbicular, rounded, or retuse, or sometimes minute, or none.
In dry soil, Missouri to Texas and New Mexico. June- Oct.