Parr 3, 1916] CARDUACEAE: ANTHEMIDEAE 275 
83. Artemisia diversifolia Rydb. Bull. Torrey Club 28: 20. 1901. 
Artemisia gnaphalodes diversifolia A. Nelson; Coult. & Nels. Man. 569. 1909. 
A perennial, with a horizontal rootstock; stem simple, white-tomentose, leafy, 3-10 dm. 
high; leaves densely tomentose on both sides, sessile, 5-10 cm. long, the lower pinnately cleft 
into 3-7 narrowly lanceolate, acuminate, rarely acute, lobes, which are directed forward, 
the upper or rarely all entire, lance-linear, attenuate; heads numerous, conglomerate and sub- 
sessile, in a narrow leafy panicle; involucre hemispheric or round-campanulate, 3-4 mm. high 
and about as broad; bracts about 10, densely floccose, in 3 series, the outer ovate, acute, 
fully half as long as the innermost; inner bracts oval, obtuse; ray-flowers about 10; corollas 
1.5 mm. long; disk-flowers about 10; corollas yellow, 2-2.5 mm. long; achenes about 1.5 mm. 
long. 
TYPE LocaLity: Priest River, Idaho. 
DIsTRIBUTION: Northwestern Ontario (James Bay) to British Columbia, California, and 
Colorado. 
84. Artemisia platyphylla Rydberg, sp. nov. 
Artemisia lucoviciana latiloba Nutt. Trans. Am. Phil. Soc. II. 7: 400. 1841. 
A perennial, with a creeping rootstock; stem 4-6 dm. high, finely tomentose, simple; 
lower leaves cuneate-obovate, 5-8 em. long, with rounded-ovate mucronate lobes above the 
middle, equally tomentose on both sides; middle leaves similar, but the lobes deeper, triangular 
or lanceolate; upper leaves ovate or lanceolate, with 3 lanceolate lobes or entire; heads many, 
conglomerate, in a narrow, spike-like panicle; involucre hemispheric, 4-5 mm. high and nearly 
as broad; bracts 10-12, in 3 series, densely floccose; outer bracts ovate, acute, half as long 
_as the innermost; inner bracts oval, obtuse; ray-flowers 5-8; corollas nearly 2 mm, long; disk- 
flowers 10-15; corollas fully 3 mm. long; achenes 1.5 mm. long. 
Type collected on sandy or gravelly banks of Spokane River, Spokane, Washington, June 
1897, Elmer 867 (herb. N. Y. Bot. Gard. 
DistRIBUrTION: Washington and Oregon to Montana, 
85. Artemisia Brittonii Rydb. Bull. Torrey Club 32: 129. 1905. 
A perennial, with a horizontal rootstock; stem stout, 3-6 dm. high, white-floccose; lower 
leaves thick, cuneate or oblong-oblanceolate, 3-5 cm. long, with 3-5 short, lanceolate, often 
somewhat divergent lobes, mostly above the middle, white-tomentose on both sides; upper 
leaves ovate-lanceolate, 3-lobed or entire; heads numerous in a dense leafy panicle; involucre 
campanulate, densely floccose, about 3 mm. high and 2 mm. broad; bracts about 12, in 3-4 
series, the outer ovate, acute, scarcely half as long as the innermost; inner bracts elliptic, 
obtuse; ray-flowers 8-10; corollas 1.5 mm. long; disk-flowers about 10; corollas 2 mm. long; 
achenes 1.5 mm. long. 
Type Locatiry: Golden, Colorado. ' 
DISTRIBUTION: Wyoming to Oregon and Coahuila. 
86. Artemisia rhizomata A. Nelson, Bull. Torrey Club 27: 34. 
1900. 
A perennial, with a cespitose rootstock; stem 4-6 dm. high, simple, white-tomentose, 
terete; leaves white-tomentose on both sides, 2-4 cm. long, the lower elliptic, oblanceolate, or 
oblong-cuneate, usually with 3-5 short ovate or lanceolate lobes, the upper lanceolate and 
entire; heads comparatively few in a narrow, spike-like panicle; branches of the latter short, 
with 2-6 erect heads; involucre campanulate, about 3.5 mm. high and 3 mm. broad, densely 
tomentose; bracts about 10, in 3 series, the outer ovate, half as long as the innermost; inner 
bracts elliptic, obtuse; ray-flowers 7 or 8; corollas nearly 1.5 mm. long; disk-flowers 7 or 8; 
corollas light-brown, 2 mm. long; achenes 1.5 mm. long. 
Tyre Locality: Sweet Water, Wyoming. 
Distripution: Wyoming to New Mexico. 
