This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", 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..
Perennial, scapose, white-tomentose throughout, root short, scaly, spindle-shaped, stem very short and thick, simple and solitary or tufted and creeping, woody. Scapes 2'-12' tall, erect; leaves crowded on the short stem, linear-oblong or oblong-spatulate, 1-3' long, mostly obtuse at the apex, flat, narrowed into petioles; petioles dilated at the base and imbricated; inflorescence regularly umbellate; involucres top-shaped, 2"-2i" long, nearly entire, rather densely clustered; peduncles 1/4'-1 1/2 long; bracts spatulate, foliaceous; calyx yellow, 3" high, top-shaped, very villous, the segments obovate; stamens and style-branches exserted; achene constricted at the middle, 2" long, villous at the summit, the angles undulate, the faces swollen.
Nebraska and Kansas to Alberta and Arizona. June-Sept.
E. pauciflorum Pursh, Fl. Am. Sept. 735. 1814. Eriogonum parviflorum Nutt. Gen. 1: 261. 1818.
Perennial, root long and slender, stems very short, simple or sparingly branched, loosely tufted, covered by the scarious dilated bases of the petioles. Scapes erect, slender, simple, slightly tomentose, 2'-6' high; leaves linear or linear-spatulate, 1'-3' long, rather obtuse, but apparently acute from the strongly revolute margins, glabrous or sparingly pubescent above, white-tomentose or cottony beneath, narrowed into slender petioles; inflorescence capitate; involucres 4-10, 1 1/2" long, turbinate-campanulate, 5-toothed, the teeth obtuse, more or less reflexed; calyx white, campanulate, 1 1/2" long, glabrous, the segments ovate; achene 1 1/4" long, its faces swollen at about the middle, inconspicuously striate-reticulated.
On dry plains Nebraska and Colorado. July-Sept.
Perennial by a slender root, scapose, densely white-tomentose throughout; stems short, tufted, much branched, sometimes several inches long. Scapes simple, 1'-5' high; leaves spatulate, 1/2'-2.' long, numerous, obtuse at the apex, narrowed below into petioles; inflorescence capitate; involucres 3-12, sessile, 1 1/2" long, 5-6-toothed, the teeth acute; bracts foliaceous, spatulate; calyx white or rose-color, 1 1/2"-2 1/2" long, campanulate, somewhat villous, 6-cleft to about the middle, the segments cuneate, obtuse or emarginate; stamens and style-branches exserted; achene 1/2" long.
On dry plains, Nebraska and Colorado. June-Aug.