262 NORTH AMERICAN FLORA [VoLuME 34 
bracts about 10, light-brown, slightly tomentose, in age glabrate, ovate, acutish, scarious- 
margined; flowers unknown, and therefore its place in the genus uncertain. 
Type collected about 50 miles north of Medicine Hat, Alberta, in May, 1914, Ernest Thompson 
Seton (herb. N. Y. Bot. Gard.). 
35. Artemisia tacomensis Rydberg, sp. nov. 
A dwarf cespitose perennial, with a stout caudex; stems about 7 cm. high, silvery-canescent, 
almost leafless; basal leaves numerous, 1-1.5 em. long, silvery-canescent, dissected into 3-5 
divisions, which are either simple or again 3-cleft into short oblanceolate lobes; stem-leaves 
small, simple, linear; inflorescence spike-like; heads short-peduncled, nodding; involucre 
hemispheric, 6-7 mm. broad, 5 mm. high, densely white-villous; bracts about 15, elliptic, 
yellow, with brown, erose margins, acutish; receptacle naked; ray-flowers few; corollas cylindric, 
2 mm. long, glandular-puberulent; disk-flowers about 30; corollas yellow, 3 mm. long, with a 
cylindric tube, campanulate throat, and 5-lobed pilose limb; achenes 1.5 mm. long. 
Type collected on Mt. Rainier, Washington, August 27, 1896, J. B. Flett (U. S. Nat. Herb. 
no. 353961). 
36. Artemisia hyperborea Rydberg, sp. nov. 
? Artemisia arctica Besser; Hook, Fl. Bor. Am. 1: 323, in part. 1833. Not A.arctica Less. 1831. 
A perennial, with a cespitose caudex or rootstock; stems 5-10 cm. high, finely white- 
tomentose, decumbent at the base; basal leaves numerous, 2—4 cm. long, finely silvery- 
tomentose, twice pinnatifid into approximate linear divisions; primary divisions 5-7, the 
secondary ones mostly 3-5; stem-leaves smaller, less divided, the primary divisions often 
entire; heads mostly conglomerate in a short spike at the end of the stems and a few remote 
solitary ones in the upper axils; involucre depressed-hemispheric, about 5 mm. high and 6 
mim. broad; bracts 10-12, broadly oval or obovate, white-tomentose on the back, with broad 
dark-brown erose scarious margins; ray-flowers 10 or more; corollas 2 mm. long, slightly 
glandular-granuliferous, 3- or 4-lobed; style slightly exserted; branches oblong; disk-flowers 
20-30; corollas yellow, deeply campanulate, slightly villous at the apex, 2.5 mm. long. 
Type collected on sand-dunes at Bernard Harbor, North West Territory, Canada, August 14, 
1915, Frits Johansen 304 (herb. Geol. Surv. Canada no. 89997). 
DISTRIBUTION: Arctic shores to Great Slave Lake, Canada. 
37. Artemisia Tyrrellii Rydberg, sp. nov. 
A more or less tufted perennial; stems 2-3 dm. high, densely silky-canescent; leaves 
1.5-3 em. long, white-silvery silky on both sides; the basal ones twice pinnatifid, with 3-5 
crowded primary divisions, which are 3—5-cleft 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. Surv. Canada no. 19439). 
38. Artemisia heterophylla Besser, Nouv. Mém. Soc. Nat. Mose. 
3: 74. 1834. 
? ATE caespitosa Besser; Hook. Fl. Bor. Am. 1: 324, in part. 1833. Not A. caespitosa Ledeb. 
833. 
A cespitose perennial, with a woody caudex; stems 1-2 dm. high, ascending at the base, 
silky-villous; basal leaves numerous, 3-6 cm. long, petioled; blades broadly obovate in outline, 
sericeous, twice dissected into linear divisions; primary divisions mostly 5, approximate, some- 
times 3, again divided into 3, rarely 4 or 5, divisions; stem-leaves smaller, mostly pinnately 
