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NORTH AMERICAN FLORA [VoLuME 34 
10. Artemisia pacifica Nutt. Trans. Am. Phil. Soc. II. 7: 401. 
1841. 
Artemisia desertorum Scouleriana Besser; Hook. Fl. Bor. Am. 1: 325. 1833. 
Artemisia Scouleriana Rydb. Bull. Torrey Club 33: 157. 1906. 
A strict perennial; stem 4-10 dm. high, glabrate or sparingly pubescent when young, 
often purplish; basal leaves clustered, petioled, 1-2 cm. long, twice pinnatifid, with narrowly 
linear divisions, more or less silky-pubescent; stem-leaves numerous, mostly sessile, often 
fascicled, pinnatifid, with narrowly linear or filiform divisions; heads very numerous in a leafy 
panicle, at first nodding, soon erect; pedicels 1-3 mm. long; involucre subglobose, about 2.5 
mm. high, 2.5-3 mm. broad; bracts 10-12, in 3-4 series, glabrous or sparingly short-hairy, 
scaridus-margined; outermost bracts ovate, acute, about half as long as the inner ones; inner 
bracts oval, acutish; ray-flowers 8-12; corollas 1.5 mm. long, glabrous; disk-flowers 8-12; 
corollas cylindro-campanulate, 2 mm. long, glabrous; style 1.5 mm. long. 
TYPE LocaLity: Shores of the Pacific at the outlet of the Oregon [Columbia River]. 
DIsTRIBUTION: Alberta and British Columbia to Oregon and Colorado (?) and New Mexico (?). 
11. Artemisia camporum Rydberg, sp. nov. 
? Artemisia campestris Pursh, Fl. Am. Sept. 521. 1814. Not A. campestris. 1753. 
Artemisia canadensis Nutt. Gen. 2: 144. 1818. Not A. canadensis Michx. 1803. 
Artemisia desertor'um Douglasiana Besser; Hook. Fl. Bor. Am. 1: 325. 1833. 
Artemisia commutata Douglasiana Besser, Bull. Soc. Nat. Mosc. 8: 70. 1835. 
Artemisia Forwoodii Rydb. Fl. Colo. 385. 1906. Not A. Forwoodii S. Wats. 1890. 
A perennial, with thick root and short caudex; stem 3-5 dm. high, striate, often purplish; 
basal leaves clustered, 4-10 cm. long, petioled, twice or thrice pinnatifid into linear or oblong 
divisions, more or less silky-canescent; stem-leaves scattered, the lower similar to the basal 
ones but smaller; upper stem-leaves sessile, pinnatifid with narrowly linear divisions, in age 
sometimes glabrate; heads numerous in a narrow leafy panicle, nodding, heterogamous; 
peduncles 1-3 mm. long; involucre hemispheric, 2.5-3 mm. high and fully as broad; bracts 
about 15, in 3-4 series, scarious-margined, the outermost ovate, obtuse, a little more than 
half as long as the innermost ones, the latter oval with rounded apex; ray-flowers 15-20; 
corollas 1.5 mm. long; achenes 0.7 mm. long; disk-flowers about 10; corollas cylindro-cam- 
panulate, 2 mm. long, glabrous; style 1.5 mm. long. 
TYPE Locality: (of A. desertorum Douglasiana) Saskatchewan. 
DISTRIBUTION: Ontario to Saskatchewan, Yukon, Arizona, and Nebraska. 
12. Artemisia campestris L. Sp. Pl. 846. 1753. 
A perennial, with a thick root and short caudex; stem 3-6 dm. high, striate, glabrous; 
basal leaves clustered, 5-10 cm. long, somewhat pubescent at first, soon glabrate, twice pin- 
natifid into linear-filiform divisions; stem-leaves scattered, mostly sessile, pinnate or the upper- 
most entire, glabrous; heads numerous in an open panicle, nodding; involucre hemispheric, 
2-2.5 mm. high and broad; bracts about 15, in 3 or 4 series, scarious-margined, the outer ovate, 
obtuse, half as long as the oval inner ones, which are rounded at the apex; ray-flowers 6-10; 
corollas 1 mm. long; achenes 0.6 mm. long; disk-flowers about 10; corollas cylindro-cam- 
panulate, 1.5 mm. long, glabrous; style 1 mm. long. 
TYPE LOCALITY: Europe. 
DISTRIBUTION: Stratford and North Haven, Connecticut, and Aiken, South Carolina; adventive 
from Europe. 
TLL UST RATIONS: A. Dietr. Fl. Boruss. pl. 635; ww Dan. fl. 1175; Engl. Bot. pl. 338; Hayne, 
Arzn. Gew. 2: pl. 9 
13. Artemisia MacCallae Rydberg, sp. nov. 
Artemisia desertorum Richardsoniana Besser; Hook. Fl. Bor. Am. 1: 325. 1833. Not A. Richard- 
soniana Besser. 1836. 
Artemisia commutata Richardsoniana Besser, Bull, Soc. Nat. Mose. 8:74. 1835. 
A perennial, with a cespitose woody caudex or rootstock; stem 2-3 dm. high, rather 
strict, more or less canescent, sometimes purplish; basal leaves 5-10 cm. long, petioled; blades 
