Brickelia grandiflora, tasselflower

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Intermountain Flora
Herbaceous perennial from long, thickened roots, 2.5-7 dm tall, minutely (and sometimes only sparsely) puberulent or hirtellous throughout; leaves all cauline, the lowermost ones opposite, reduced and deciduous, the others well distributed along the stem and at least the upper ones alternate, evidently petiolate, the petiole 0.3-7 cm long, the blade deltoid-ovate or -lanceolate to subcordate, toothed, 2-11 cm long and 1-6 cm wide, mostly 1-2.5 times as long as wide; heads several or numerous in a short, corymbiform or subumbelliform inflorescence, often nodding on the slender peduncles; involucre 7-12 mm high, its outer bracts tipped with a well developed slender appendage; flowers ochroleucous or chloroleucous, mostly 20-40 in each head, rarely as many as 70; achenes 4-5 mm long; 2n = 18.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg. 380, vol. 5, The New York Botanical Garden New York.