268 NORTH AMERICAN FLORA [VoLuME 34 
55. Artemisia arachnoidea Sheldon, Bull. Torrey Club 30: 310. 
1903. 
A perennial, with a branched rootstock or caudex; stems 5-10 dm. high, striate, arachnoid- 
floccose; leaves linear-lanceolate, acuminate or acute, sessile, sparingly floccose but soon glab- 
rate above, permanently floccose beneath, 3-8 cm. long, 5-$ mm. broad, the lower with a few 
lanceolate short lobes, the upper entire; heads many in a lax panicle, often sub-secund and 
nodding; involucre hemispheric, about 4 mm. high and 6 mm. broad; bracts about 10, in about 
3 series, sparingly floccose, yellowish-green, the outer ovate, acute, about half as long as the 
innermost; inner elliptic, acute or obtuse, scarious-margined; ray-flowers 8—10; corollas 1.5 
mum. long; disk-flowers 25-30; corollas bright-yellow; achenes more than 1 mm. long. 
TyPE LocALity: Banks of the Columbia, one mile west of Vancouver, Washington. 
DISTRIBUTION: Washington, Oregon, and northwestern Idaho. 
56. Artemisia Hookeriana Besser; Hook. Fl. Bor. Am. 1: 322. 
1833. 
A tall perennial, with a rootstock; stem 3-6 dm. high, sparingly floccose when young, 
soon glabrate, striate; leaves lanceolate or ovate in outline, glabrate above, densely white- 
tomentose beneath, the upper entire, the lower deeply cleft into 3-7 lanceolate often falcate 
divisions; heads numerous in ¥ery dense elongate panicles, mostly erect; involucre campanu- 
late, about 4 mm. high and 3 mm. broad, more or less tomentose; bracts about 12, in about 3 
series, the outer ones ovate, half as long as the innermost; inner bracts elliptic, obtuse, scarious- 
margined, yellow; ray-flowers 5 or 6; corollas 2 mm. long; disk-flowers 5 or 6, fertile; corollas 
nearly 3 mm. long; achenes 1.5 mm. long. 
TYPE LOCALITY: Rocky Mountains [Canada]. 
DistR1BuTion: Saskatchewan to British Columbia and Oregon. 
57. Artemisia Douglasiana Besser; Hook. Fl. Bor. Am. 1: 323, 
1833. 
Artemisia integrifolia Less. Linnaea 6: 523. 1831. Not A. integrifolia Ll. 1753. 
Artemisia vulgaris californica Besser, Linnaea 15: 91. 1841. 
Artemisia vulgaris Douglasiana D.C. Eaton, in S. Wats. Bot. King’s Expl. 183. 1871. 
Artemisia Kennedyi A. Nelson, Proc. Biol. Soc. Wash. 18: 175. 1905. 
A stout perennial, with a rootstock; stem 6—10 dm. high, simple, striate, somewhat tomen- 
tose; leaves numerous, 5-15 cm. long, lanceolate, acuminate, the lower more or less lobed or 
toothed, with few lanceolate lobes or teeth, the upper ones entire, all somewhat grayish-floccose 
above when young, glabrate in age, permanently white-tomentose beneath; heads numerous, 
at first nodding, in a large dense narrow leafy panicle 3-5 dm. long; involucre rounded-campanu- 
late, 4 mm. high, 3-4 mm. broad; bracts 10-12, in 3-4 series, tomentose, at least when young, 
the outer lanceolate, acutish, half as long as the innermost, the inner elliptic, obtuse, broadly 
scarious-margined above; ray-flowers 6-8; corollas 2 mm. long; disk-flowers 10-18; corollas 
2-2.5 mm. long; achenes 1.5 mm. long, oblong, striate. 
TYPE LocaLity: Northwest America. 
DIsTRIBUTION: Southern Washington and Idaho to southern California. 
58. Artemisia Herriotii Rydb. Bull. Torrey Club 37: 455. 1910. 
A tall perennial herb, with a rootstock; stem simple, 6-10 dm. high, finely tomentose; 
leaves entire or sparingly and sharply toothed, 5-20 cm. long, 5-15 mm. wide, glabrate and 
green above, densely white-tomentose beneath, rather thin, the teeth lanceolate and directed 
forward; heads very numerous, erect, in a narrow dense panicle; branches erect; involucre ob- 
long, 4-5 mm. high, 2.5—3 mm. broad; bracts 10-14, in 3-4 series, tomentose, the outer ovate- 
lanceolate, acute, half as long as the innermost; inner bracts elliptic, mostly obtuse; ray-flowers 
6-8; corollas 2 mm. long; disk-flowers 5-7; corollas 2.5 mm. long; style-branches truncate, 
erose at the tips; achenes 1.5 mm. long, finely striate. 
TYPE LOCALITY: Edmonton, Alberta. 
DistRipuTion: Alberta and Saskatchewan to South Dakota. 
