Common Yarrow

Achillea fusca Rydberg, sp. nov
A stout perennial, with a creeping rootstock; stem 3-6 dm. high, sulcate, simple, longvillous; leaves 1-2 dm. long, 5-10 mm. wide, or the basal ones 2-3 cm. wide, bipinnatifid, linear or the lower linear-oblanceolate in outline, long-villous; primary divisions short, ascending, ovate in outline, the ultimate ones lanceolate or ovate, callousthickened towards the spinulose-mucronate tip; heads in a rather dense rounded corymbiform panicle; involucre about 5 mm. high and 4 mm. broad, villous; bracts about 20, in 4 series, the outer oval, the inner elliptic, all rounded or obtuse at the apex; margins dark-brown, almost black; ray-flowers about 5; ligules white or pinkish, suborbicular, round-lobed, 3-4 mm. long; disk-flowers 20-25; corollas yellowish-white or pinkish, 3 mm. long; achenes nearly 3 mm. long, strongly margined.
Type collected on hillsides, Mt. Paddo, [Washington,] September 28, 1893, Suksdorf 1606 (herb. Columbia Univ.).
DisTRiBUTio.v: Washington to Alberta, Vancouver Island, and Yukon.

Achillea subalpina Greene, Leaflets 1 : 145. 1905
Achillea lanulosa alpkola Rydb. Mem. N. Y. Bot. Card. 1: 426. 1900.
^dii7;ea a/^KoJo Rydb. Bull. Torrey Club 33: 157. 1906.
Achillea Millefolium alpicola Garrett, Spring Fl. Wasatch Reg. 101. 1911.
A low peremiial, with a creeping rootstock; stem 1-3 dm. high, striate, sparingly villous, simple; leaves 5-10 cm. long, 4-10 mm. wide, bipinnatifid, sparingly villous, the lower linear, oblanceolate in outline and petioled, the upper sessile and linear; primary divisions ovate in outline, short, usually ascending and crowded, the ultimate ones lanceolate or lance-linear, spinulose-mucronate ; heads not numerous, in small congested, round-topped corymbs with short branches; involucre campanulate, 3.5-4 mm. high and about 3 mm. broad, sparingly villous; bracts about 20, in 4 series, the outer ovate, the inner elliptic, all obtuse and with darkbrown or almost black margins; ray-flowers 5; hgules suborbicular, round-lobed, 2-3 mm. long, white or pinkish; disk-flowers 15-20; corollas yellowish-white, 2.5 mm. long; achenes 2 mm. long, narrowly margined.
TPE locality: Subalpine slopes of Mount Ouray, Colorado.
Distribution: High mountains, from Hudson Bay and Alberta to New Mexico, California, British Columbia, and Yukon; Gaspe Peninsula, Quebec.