Artemisia silvicola

Artemisia silvicola Osterhout, Bull. Torrey Club 28: 645 1901.
Artemisia mexicana silvicola A. Nelson; Coult. & Nels. Man. 569. 1909.
A perennial herb, with a creeping rootstock; stem 4-6 dm. high, slender, finely whitetomentose, striate; leaves many, narrowly linear-lanceolate, 4-6 cm. long. 4-S mm. wide, all entire or the lower with a few short lobes or teeth, acuminate, sessile, loosely floccose but soon glabrate and green above, densely white-tomentose beneath; heads numerous in a loose leafy panicle, often nodding when young; involucre hemispheric, 4-5 mm. high and about as broad; bracts 10-12, in 3 series, grayish, sparingly arachnoid-tomentose, the outer ones ovate, half as long as the innermost; inner bracts oval, obtuse, broadly scarious-margined; rayflowers 10-15; corollas cylindric, 1.5 mm. long; disk-flowers 10-20; corollas 2 mm. long; achenes 1 nun. long.
Type locality: Maclntyre Creek, a branch of Laramie River, Colorado. Distribution: Texas, Colorado, and Utah to California and Chihuahua.