Heliomeris multiflora, showy goldeneye

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Intermountain Flora
Perennial herb (sometimes suffratescent at the base) from a short taproot, or sometimes nearly fibrous-rooted from a compact caudex; stems several, slender, 2-13 dm tall; herbage strigose to scabrous-puberulent; leaves linear to lance-ovate or seldom elliptic, weakly triplinerved (or scarcely so when very narrow), entire or occasionally obscurely toothed, all but the upper most ones opposite, the principal ones mostly 3-8 (10) cm long and 2-25 (30) mm wide, shortly petiolate or subsessile; heads medium-sized, the yellow disk commonly 6-15 mm wide; involucre 5-10 mm high, its bracts linear or lanceolate, wholly herbaceous, obscurely 2- or 3-seriate, the outer from a little shorter to a little longer than the inner; rays mostly (8) 10-16, 1-2 cm long and 3-5 mm wide; achenes glabrous, black, narrowly turbinate, 2.5-3 mm long; pappus none; 2n = 16, seldom 32.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg.24, vol. 5, The New York Botanical Garden New York.