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FNA | Family List | FNA Vol. 20 | Asteraceae | Senecio

22e. Senecio integerrimus Nuttall var. exaltatus (Nuttall) Cronquist, Leafl. W. Bot. 6: 48. 1950.

Senecio exaltatus Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 410. 1841; S. dispar A. Nelson; S. hookeri Torrey & A. Gray; S. integerrimus Nuttall var. vaseyi (Greenman) Cronquist; S. lugens Richardson var. exaltatus (Nuttall) D. C. Eaton; S. perplexus A. Nelson; S. vaseyi Greenman

Herbage copiously to sparsely arachnose, tomentose, or villous at flowering. Leaves: basal and proximal cauline usually indistinctly petiolate; blades (cauline) mostly elliptic to lanceolate or oblanceolate, sometimes rounded-deltate or suborbiculate. Heads 6–15(–30+). Phyllaries ± lanceolate, (4–)5–10 mm, tips black. Ray florets usually ± 5, sometimes 0; corollas yellow, laminae 6–15 mm.

Flowering spring. Open woodlands, sagebrush plains, meadow grasslands from foothills to above timberline; 500–3200 m; Alta., B.C., Sask.; Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Variety exaltatus is the most widespread and variable variety of the species. Eradiate plants of var. exaltatus have been recognized as var. vaseyi; there appears to be no populational integrity to the eradiate condition.


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