Senecio integerrimus, Columbia groundsel

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Intermountain Flora
Stout, fibrous-rooted perennial from a very short, erect crown; root fibrous, unbranched or only sparingly branched; stem erect, solitary, 2-7 (12) dm tall; herbage hirsute to arachnoid-villous with crisp loose hairs when young, generally more or less glabrate in age (or sometimes sooner); leaves entire to irregularly callous-dentate, basally disposed, the basal ones petiolte, commonly 6-25 cm long overall, the blade mostly 1-6 cm wide tapering to the petiole, rarely broad-based and subcordate; cauline leaves progressively reduced upwards, becoming sessile; heads several or rather numerous in an often congessted inflorescence, the peduncle of the terminal head consistently thickened and short, well surpassed by the other peduncles; involucre mostly 5-10 mmhigh, its bracts mosstly ca 21, less often ca 13 or ca 8, bright yellow, mostly 6-15 mm long; achenes ordinarily glabrous, seldom hirtellous along the angles; 2n = 40, 80.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg.178, vol. 5, The New York Botanical Garden New York.