Artemisia tridentata (big sagebrush)

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Intermountain Flora
Aromatic shrubs mostly 4-30+ dm tall, freely branched upwards, tending to have a crooked central trunk (which may have two or three main branches) toward the base, neither spreading undergound nor sprouting after fire; herbage gray, closely and persistently sericeous-tomentose; leaves crowded, narrowly cuneate (sometimes almost linear), mostly 1-4 cm long (to 6 cm in var. parishii), generally most or all of them (at least on the vegetative branches) tridentate across the end, many of them persistent throughout the winter; flowering branches annual, 1 to several dm long, their leaves more scattered, often many or most of these leaves (especially the upper) entire; inflorescences evidently leafy-bracteate below, more shortly and inconspicuously so upwards, thyrsoidly elongate-paniculiform, mostly 1.5-10 (15) cm wide, loose and open in comparison with related species, but the heads individually sessile or nearly so, often in small glomerules; involucre canescent, at least below, mostly 3-5 mm high; receptable without hairs; flowers mostly 3-8 (11) per head, all perfect and potentially fertile; achenes glabrous or resinous-glandular, or seldom arachnoid-hairy, columnar-prismatic (or slightly expanded upwards), with several unequally disposed rib-angles; 2n = 18, 36, seldom 54.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg.158, vol. 5, The New York Botanical Garden New York.