Solidago ptarmicoides (Nees) B.Boivin
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems 1–7 dm from a branched caudex, scabrous at least above; lvs firm, glabrous or scabrous, entire or with a few remote salient teeth, tending to be trinerved, 3–20 cm × 1.5–10 mm, the lower linear-oblanceolate and petiolate, sometimes tufted, persistent, and larger than those above, sometimes smaller and deciduous, the others becoming sessile upward and linear or nearly so; heads mostly 3–60 in an open, minutely bracteate, corymbiform infl; invol (4)5–7 mm, glabrous, its bracts imbricate, firm, greenish above but scarcely herbaceous, often with strongly thickened midrib; rays 10–25, white, 5–9 mm; disk-fls numerous, white; achenes glabrous; pappus copious, many of the bristles clavellate- thickened and subplumose toward the tip; 2n=18. Prairies and other open, usually dry, commonly calcareous places; Vt., N.Y., and w. Que. to Ga., w. to Sask., Colo., and Ark. (Aster p.; Unamia p.) Hybrids with S. rigida var. humilis have been called Aster or Unamia or S. ×lutescens (DC.) B. Boivin; those with S. ohioensis have been called S. ×krotkovii B. Boivin; and those with S. riddellii have been called S. ×bernardii B. Boivin; European garden-hybrids, presumably with S. canadensis, have been called Solidaster luteus M. L. Green.