Gaillardia aristata Pursh
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Hairy perennial 2–7 dm from a slender taproot, also spreading by slender creeping roots; lvs narrow, linear-oblong to lance-ovate, or the lower oblanceolate, to 15 × 2.5 cm, entire to somewhat pinnatifid; heads solitary or few, long-pedunculate, the disk 1.5–3 cm wide, purple or brownish-purple (yellow); rays 6–16, yellow, usually purplish at base, 1–3.5 cm; setae of the receptacle evidently exceeding the achenes; style-appendages elongate; 2n=36, 72. Plains, meadows, and other open places; B.C. to Sask. and Minn., s. to Ariz. and N.M., and occasionally intr. or escaped eastward. May–Sept.