Solidago canadensis, goldenrod

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Intermountain Flora
Perennial from creeping rhizomes, without any well developed caudex, mostly 4-20 dm tall, the stem puberulent in the upper half or two-thirds, but glabrous toward the base; leaves mainly or all cauline, the basal ones wanting, or, like the lower cauline ones, reduced and soon deciduous, the others numerous and crowded, well distributed along the stem, only gradually or scarcely reduced upwawrds, lance-linear to lance-elliptic, tapering to sessile base, triplinerved, sharply serrate to occasionally entire, puberulent on the midrib (and usually also the main lateral veins) beneath, otherwise mostly glabrous or inconspicuously scaberulous, seldom thinly scaberulous-puberulent across both sides, the larger ones commonly 5-15 cm long and 0.5-2.5 (3.5) cm wide; inflorescence broadly paniculiform, with recurved-secund branches (especially in plants of lower elev.), varying (especially in plants of upper elev.) to elongate-thyrsoid and not at all secund; involucre (2.5) 3-4 (5) mm high, its bracts well imbricate, thin and slender, usually narrowly pointed; rays mostly 10-17, commonly ca 13, narrow and short, 1.5-2.5 mm long; disk-flowers (6) 8-13; 2n = 18, 36, 54 (var. salebrosa).

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg.250, vol. 5, The New York Botanical Garden New York.