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bo 
NORTH AMERICAN FLORA [VoLUME 34 
71. Artemisia Underwoodii Rydb. Bull. Torrey Club 32: 129. 
1905. 
A perennial, with a horizontal branched rootstock; stem slender, 2-6 dm. high, somewhat 
floccose, simple up to the inflorescence; leaves alternate, 3-5 cm. long, pinnately parted, with 
3-7 (usually 5) linear or lance-linear acute divisions, green and slightly floccose but soon 
glabrate above, densely white-tomentose beneath; heads very numerous in a leafy narrow 
panicle, nodding; involucre campanulate, 2.5-3 mm. high and about as broad; bracts 10-12, 
in about 3 series, more or less floccose, the outermost bracts ovate, half as long as the inner- 
most, acute; inner bracts oval, obtuse, scarious-margined; ray-flowers 8-10; corollas 1.5 mm. 
long; disk-flowers 10—15; corollas 2 mm. long; achenes fully 1 mm. long. 
TYPE LOCALITY: Ouray, Colorado. 
DistR1BuTION: Colorado to Nevada, California, and Arizona. 
72. Artemisia revoluta Rydberg, sp. nov. 
Artemisia mexicana angustifolia Schultz-Bip.; Urbina, Cat. Pl. Mex. 187, hyponym. 1897. 
A tall perennial, with a rootstock; stem 4-10 dm. high, appressed-arachnoid, strict, 
striate; leaves numerous, 5-7 cm. long, irregularly pinnatifid into narrowly linear, revolute 
segments or the upper entire, pilose and green above, densely white-tomentose beneath; 
heads numerous in narrow leafy panicles, erect; involucre campanulate, 4 mm. high, 2-3 mm. 
broad, sparingly arachnoid-tomentose; bracts about 12, in 3-4 series, the outer ovate, acute, 
half as long as the innermost; inner bracts elliptic, obtuse; ray-flowers about 10; corollas 1.5 
mim. long; disk-flowers 3-5; corolla 2 mm. long; achenes 1 mm. long. 
‘Type collected near city of Chihuahua, November 4, 1885, Pringle 290 (herb. N. Y. Bot. Gard.). 
DistrRiBpuTION: Chihuahua to San Luis Potosi, Zacatecas, and Sonora. 
73. Artemisia Lindleyana Besser; Hook. Fl. Bor. Am. 1: 322. 
1833. 
Artemisia pumila Nutt. Trans. Am. Phil. Soc. II. 7: 399. 1841. Not A. pumila Link. 1822. 
A perennial, suffruticose at the base, with a thick woody base; stem 1.5—4 dm. high, with 
erect branches, slightly tomentose; lower leaves 2-4 cm. long, oblanceolate in outline, with 
3-7 short lanceolate lobes, more or less floccose, or in age glabrate above, white-tomentose 
beneath; upper leaves linear or linear-oblanceolate, usually entire; heads comparatively few 
in a lax, narrow, spike-like panicle; involucre campanulate, about 3 mm. high, nearly as broad; 
bracts 10-14, in about 3 series, more or less densely tomentose, the outer lanceolate, half as 
long as the innermost; inner bracts elliptic, obtuse; ray-flowers about 6; corollas 1.5 mm. 
long; disk-flowers 12-15; corollas 2—2.5 mm. long. 
TYPE LocaLity: Northwest coast of America. 
DIsTRIBUTION: Montana to Washington, northern California, Arizona, and western New 
Mexico. 
74. Artemisia serrata Nutt. Gen. 2: 142. 1818. 
Artemisia ludoviciana serrata 'T. & G. Fl. N. Am. 2: 420. 1843. : 
A tall perennial, with a rootstock; stem 1-3 m. high, slightly floccose when young, but 
soon glabrous, striate; leaves numerous, lanceolate to linear-lanceolate, acuminate, closely 
and sharply serrate, green and glabrous above, white-tomentose beneath, 7-15 cm. long, 
6-25 mm. wide; heads very numerous in a leafy panicle, mostly erect; involucre campanulate, 
about 3 mm. high and 2 mm. broad, slightly floccose; bracts about 10, in 3 series, the outer 
ovate, acute, about half as long as the innermost; inner bracts elliptic, obtuse; ray-flowers 6-8; 
corollas about 1 mm. long; disk-flowers 10-12; corollas nearly 2 cm. long; achenes 1 mm, long. 
TyPE LocaLity: Near the Prairie du Chien, on the banks of the Mississippi. 
DISTRIBUTION: Illinois to Kansas, and North Dakota; introduced in northern New York. 
ILLUSTRATIONS: Britt. & Brown, Ill. Fl. f. 4013; ed. 2. f. 4586. 
