Achillea alpina subsp. multiflora (Hook.) D. F. Murray & Elven

Achillea multiflora Hook. Fl. Bor. Am. 1: 318. 1833
Ac/M7ica P/acmiVa Richards, in Frankl. Journey ed. 2. App. 33. 1823. Not A. Ptarmicah. 1753.
A perennial, with a rootstock; stem usually 5-8 dm. high, sulcate, sparingly villous or in
age glabrate; leaves linear, 5-10 cm. long, 4-8 mm. wide, incised or doubly serrate, sparingly
villous or glabrate; heads numerous, in compound corymbiform panicles; involucre roimded-
campanulate, about 5 mm. high and broad; bracts about 25, in 4 series, sparingly villous
or glabrate, the outer lanceolate, acute, half as long as the oblong obtuse innermost ones;
ray-flowers 6-12; ligules white, broader than long, 1-1.2 mm. long, 2 mm. wide; disk-flowers
25-30; corollas yellowish-white, 2.5 mm. long; achenes 2.5 mm. long, broadly wing-margined.
Type locality: Wooded country as far north as Fort Franklin, British America. Distribution: Manitoba to Alberta, Alaska, and the Arctic coast.