Artemisia kruhsiana subsp. alaskana (Rydb.) D. F. Murray & Elven

Artemisia tyrrellii Rydberg, sp. nov
A more or less tufted pereimial; stems 2-3 dm. high, densely silky-canescent ; leaves 1.5-3 cm. long, white-silvery silky on both sides; the basal ones twice pinnatifid, with 3-5 crowded primary divisions, which are 3-5-cIeft into oblanceolate or spatulate divisions; lower stem-leaves mostly twice ternate and the upper ternate to entire and linear; heads racemose, nodding; peduncles 2-10 mm. long; involucre hemispheric, about 5 mm. high and 7 mm. broad; bracts 12-15, elliptic, densely canescent on the back, with conspicuous dark-brown scarious margins; ray-flowers about 10; corollas about 2 mm. long; disk-flowers about 30; corollas trumpet-shaped, 2.5 mm. long, glandular-granuliferous and somewhat hairy; achenes 1.5 mm. long.
Type collected on the Selkirk Trail, northern British Columbia, September 6, 1898, J. B. Tyrrell (herb. Geol. Suriv. Canada no. 19439).

Artemisia alaskana Rydberg, sp. nov
A low shrub, 3-5 dm. high; branches simple, sparingly tomentose; lower leaves twice dissected, first pinnate with 5 divisions, each ternately cleft into oblong or linear obtuse divisions, white-tomentose on both sides, the middle leaves twice temate, the uppermost ternate, with linear divisions, or entire and linear; inflorescence racemiform; branches simple or with 2 or 3 heads, elongate, 1-7 cm. long; heads nodding; involucre hemispheric, about 5 mm. high, 6-7 mm. broad; bracts about 15, in 3 series, the outer linear-oblong, villous-tomentose, the inner oval, with scarious erose margins; ray-flowers 7-10; corollas tubular, 1.5 mm. long, glandular-puberulent; disk-flowers about 50; corollas glandular-granuliferous below, funnelform; achenes 1.5 mm. long. (Closely related to the Siberian A. Turczaninoviana Besser.)
Type collected on the Yukon River, between Nulata and Nowikakat, in July, 1889, /. C. Russell (U. S. Nat. Herb. no. 417571).