274 NORTH AMERICAN FLORA [VoLuME 34 
densely floccose, the outer more than half as long as the innermost; ray-flowers about 12; 
corollas 1.5 mm. long; disk-flowers 25-30; corollas nearly 3 mm. long; achenes 1.5 mm. long. 
TyPE LocaLiry: Gunnison, Colorado. : 
DISTRIBUTION: Known only from the type locality. 
79. Artemisia argophylla Rydberg, sp. nov. 
A perennial, with a strong rootstock; stem 5-10 dm. high, white-tomentose, angled; 
leaves many, lanceolate, entire or the lower oblanceolate, sometimes coarsely toothed or with 
lanceolate lobes, 5-10 cm. long, 8-20 mm. wide, white-tomentose on both sides, acute; heads 
numerous in a leafy panicle; involucre hemispheric, 4-5 mm. high, 5-7 mm. broad, densely 
tomentose; bracts 12-14, the outer lanceolate, acute, more than half as long as the innermost; 
inner bracts elliptic or oval, obtusish; ray-flowers 12-16; corollas nearly 2 mm. long; disk- 
flowers 15-25; corollas yellow, 2.5 mm. long; achenes 1.5 mm. long. 
Type collected near Longs Peak, August 14, 1907, F. E. Clements (herb. N. Y. Bot. Gard.). 
DistRiBuTION: Colorado and Wyoming to Northern California and Washington. 
80. Artemisia longifolia Nutt. Gen. 2: 142. 1818. 
Artemisia integrifolia Pursh, Fl. Am. Sept. 520. 1814. Not A. seers oNe Ee Visas 
Artemisia ludoviciana integrifolia A. Nelson, First Rep. Fl. Wyo. 138. 
Artemisia natronensis A. Nelson, Bull. Torrey Club 26: 485. 1899. 
A perennial, with a horizontal rootstock; stem 3-10 dm. high, white-tomentose; leaves © 
linear or linear-lanceolate, 6-15 cm. long, often revolute, loosely floccose or in age glabrate 
above, white-tomentose beneath, sometimes caudate-attenuate; heads many in a narrow pani- 
cle, mostly erect and peduncled; involucre rounded-campanulate, 4-5 mm. high, 3-4 mm. 
broad, densely tomentose; bracts about 12, in about 3 series; outer bracts ovate, acute, fully 
half as long as the innermost; inner bracts oval, acute; ray-flowers 5-8; corollas nearly 2 mm. 
long; disk-flowers 15-25; corollas light-yellow, nearly 3 mm. long; achenes nearly 2 mm. long. 
(A. natronensis is a form with somewhat broader and shorter leaves.) 
TYPE LocaLity: Banks of the Missouri, at the confluence of White River, South Dakota. 
DISTRIBUTION: Manitoba to Nebraska, ‘Oregon, and Washington. 
ILIUSTRATION: Britt. & Brown, Ill. Fl. f. 4014; ed. 2. f. 4587. 
81. Artemisia obtusa Rydberg, sp. nov. 
Artemisia longifolia Besser; Hook. Fl. Bor. Am. 1: 323, in part. 1833. 
oiled ludoviciana latiloba 'T. & G. Fl. N. Am. 2: 420, in part. 1843. Not A. ludoviciana lati- 
oba Nutt. 1841. 
A perennial, with a rootstock; stem floccose, about 5 dm. high, simple, leafy; leaves thick, 
4-10 em. long, loosely floccose above, more glabrate in age, densely white-tomentose beneath, 
the lower ones pinnately parted into 3-7 oblong obtuse divisions, the upper entire; heads many 
in a dense, narrow, and rather short panicle; involucre round-campanulate, about 3 mm. 
long and nearly as broad; bracts 10-12, densely tomentose, in 3 series, the outer ovate, half 
as long as the innermost; inner bracts elliptic, obtuse; ray-flowers 5 or 6; corollas 1.5 mm. 
long; disk-flowers 6-8; corollas light-brown, 2 mm. long. 
Type collected on the Columbia, Scouler 234 (herb. Columbia Univ.). 
DIsTRIBUTION: Washington. 
82. Artemisia texana Rydberg, sp. nov. 
A perennial; stem 3—5 dm. high, white-tomentose; leaves white-tomentose on both sides, 
2-5 em. long, 5-10 mm. wide, the upper linear-lanceolate, the lower 3-cleft to near the mid- 
rib into linear lanceolate lobes; inflorescence paniculate, leafy, the branches raceme-like; 
involucre broadly campanulate, densely tomentose, 3 mm. high and broad; bracts about 10, 
in 3 series, the outer ovate, half as long as the inner ones, which are oval, obtuse; ray-flowers 
5 or 6; corollas about 1 mm. long; disk-flowers 8-10; corollas yellow, glandular-granuliferous 
below, funnelform, nearly 2 mm. long; achenes less than 1 cm. long. 
Type collected at Colorado, Texas, October 16, 1902, Tracy 8141 (U. S. Nat. Herb.). 
DISTRIBUTION: Texas. 
