Part 3, 1916] CARDUACEAE: ANTHEMIDEAE 255 
ovate in outline, twice pinnatifid, with rather few linear or narrowly oblanceolate divisions, 
more or less silky-canescent; lower stem-leaves similar but smaller, the upper less divided 
and those of the inflorescence often simple; heads rather numerous in narrow panicles, soon 
ascending or erect, short-peduncled or subsessile; peduncles rarely more than 2 mm. long; in- 
volucre hemispheric, 3 mm. high, 4-5 mm. broad; bracts 10-14, in about 3 series, green with 
yellowish scarious margins, acutish, sparingly long-hairy or glabrous; outer bracts ovate, about 
half as long as the inner broadly oval ones; ray-flowers 10-15; corollas more than 1.5 mm. long; 
achenes more than 1 mm. long; disk-flowers about 15; corollas cylindro-campanulate, 2.5 mm. 
long, glabrous; style 2 mm. long, filiform. 
Type collected on gravelly slopes of Tunnel Mountain, vicinity of Banff, Alberta, 1899, MacCalla 
2016 (herb. N. Y. Bot. Gard.). 
DistRiBpuTIon: Alberta to Yukon and Washington; Colorado. 
14. Artemisia canadensis Michx. Fl. Bor. Am. 2: 128. 1803. 
Artemisia peucedanifolia Juss.; Besser, Bull. Soc. Nat. Mose. 8:91. 1835. 
A perennial, with a cespitose rootstock; stem ascending or decumbent at the base, 1-3 dm. 
high, sparingly long-hairy or glabrate, striate; basal leaves clustered, 5-10 cm. long, petioled, 
appressed-silky, twice pinnatifid into narrowly linear to oblanceolate divisions rarely more 
than 1 mm. wide; stem-leaves smaller, rather few, pinnately divided into linear divisions or 
the upper ternate or simple; heads rather few in a narrow panicle, subsessile or short-peduncled, 
nodding; peduncles 2 mm. long or less; involucre hemispheric, 2.5—-3 mm. high, 4-6 mm. broad; 
bracts 10-12, in about 3 series, glabrous, broadly scarious-margined, all broadly oval and 
acutish, the outer scarcely shorter; ray-flowers 10-15; corollas nearly 2 mm. long, glabrous; 
disk-flowers 20-25; corollas cylindro-campanulate, 5-toothed, glabrous, 2.5 mm. long; style 
2 mm. long. 
TYPE LOcCALIty: Hudson Bay. 
DISTRIBUTION: Newfoundland to Vermont, Michigan, and Western Ontario; Yukon (?). 
Intustrations: Britt. & Brown, Ill. Fl. f. 4000; ed. 2. f. 4573. 
15. Artemisia Bourgeauana Rydb. Bull. Torrey Club 37: 454. 1910. 
A strict perennial, with a taproot and short caudex; stem 3-4 dm. high, rather densely 
silky-villous, more or less tinged with red; basal leaves clustered, 4-6 dm. long, petioled, 
sericeous-canescent on both sides, twice pinnatifid with oblanceolate divisions; stem-leaves 
mostly sessile, rather small, pinnatifid with linear divisions, or those of the inflorescence 3-fid 
or entire; heads very numerous in dense leafy panicles, horizontal or nodding, subsessile or 
short-peduncled; involucre hemispheric, about 4 mm. high and 5 mm. broad; bracts 12-15, 
in about 3 series, yellowish, silky-villous, scarious-margined, the outermost about half as long 
as the innermost, ovate, acute; inner bracts oval, rounded at the apex; ray-flowers about 20; 
corollas 1.5 mm. long; achenes fully 1 mm. long; disk-corollas 2.5 mm. long, elongate-campanu- 
late, the teeth sparingly long-hairy; style slightly tapering from the summit. 
TYPE LOCALITY: Saskatchewan. 
Distrisution: Saskatchewan and North Dakota. 
16. Artemisia spithamaea Pursh, Fl. Am. Sept. 522. 1814. 
Artemisia groenlandica Wormsk. Fl. Dan. 27: 10. 1818. 
Artemisia borealis Purshii Besser; Hook. F1. Bor. Am. 1: 326. 1833. 
Artemisia borealis Wormskjoldii Besser, Bull. Soc. Nat. Mosc. 8: 84, in part. 1835. 
Artemisia borealis Besseri T. & G. Fl. N. Am.@: 417, 1843. 
Artemisia borealis spithamaea T. & G. Fl. N. Am. 2: 417. 1843. 
A perennial, with a cespitose rootstock; stem often decumbent at the base, more or less 
silky-canescent or in age glabrate, 1-2.5 dm. high; basal leaves clustered, 4-8 cm. long, petioled, 
silky-canescent; blades ovate or obovate in outline, usually twice pinnatifid into linear-oblance- 
olate divisions; lower stem-leaves similar but smaller or pinnatifid with linear divisions, those 
of the inflorescence 3-fid or simple; heads heterogamous, erect, subsessile, usually in narrow 
spike-like panicles, or the panicle in larger specimens more open and branched; involucre 
