Part 3, 1916] CARDUACEAE: ANTHEMIDEAE 
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20. Artemisia pycnocephala (Less.) DC. Prodr. 6: 99. 1837. 
Oligosporus pycnocephalus Less. Linnaea 6: 524. 1831. 
Artemisia pachystachya DC. Prodr. 6: 114. 1837. 
Artemisia pycnostachya Nutt. Trans. Am. Phil. Soc. II. 7: 401. 1841. 
A perennial, with a cespitose woody caudex or rootstock; stems decumbent at the base, 
2-4 dm. high, densely villous; basal leaves numerous, crowded, 3-7 cm. long, petioled; blades 
obovate in outline, twice pinnatifid, with rather short, oblanceolate or linear-oblanceolate 
divisions, densely silky-villous; stem-leaves numerous, similar but shorter, short-petioled 
and less divided; heads in a very dense, spike-like, leafy panicle, erect, sessile; involucre hemi- 
spheric, about 3 mm. high and 4 mm. broad; bracts broadly ovate, acutish, densely villous, 
the outer somewhat shorter; ray-flowers 8-10; corollas fully 1.5 mm. long; achenes 1.5 mm. 
long; disk-flowers 12-15; corollas elongate-funnelform, 2.5 mm. long, the teeth usually sparingly 
long-hairy; style tapering from the summit. 
TYPE LocaLity: California. 
DISTRIBUTION: Sandy beaches from central Oregon to Monterey, California. 
Il. Filifoliae. Style of the disk-flowers slightly cleft, but the branches erect or ascending, 
truncate, ending in penicillate appendages on the outer border; that of the ray-flowers 
more or less exserted, with linear-filiform spreading branches. Corollas more or less glandular- 
granuliferous, those of the ray-flowers subcylindric, 2-3-toothed, split on one side and some- 
what tapering towards the apex, those of the disk-flowers elongate-turbinate or narrowly 
funnelform, 5-toothed. Low shrubs or undershrubs, with canescent leaves ternately or bi- 
ternately divided into linear-filiform divisions. 
21. Artemisia filifolia Torr. Ann. Lyc. N. Y.2: 211. 1827. 
Artemisia plattensis Nutt. Trans. Am. Phil. Soc. II. 7: 397. 1841. 
A shrub 3-10 dm. high, with ascending, slender, canescent branches; leaves 3-8 cm. 
long, ternately divided into filiform divisions or entire and filiform, strigulose-canescent, often 
fascicled; heads very numerous in leafy panicles, nodding; involucre subglobose, 1.5-2 mm. 
high and as broad; bracts 8-9, suborbicular, in about 3 series, the outer much shorter, densely 
canescent; ray-flowers 2 or 3; corollas 1 mm. long; achenes about 1 mm. long; disk-flowers 1-4; 
corollas elongate-turbinate, scarcely 2 mm. long; style 1.5 mm. long, 2-cleft at the apex. 
Type LocaLity: Not given. 
DISTRIBUTION: Nebraska and Wyoming to Nevada, Chihuahua, and Texas. 
ILLUSTRATIONS: Torr. in Marcy, Expl. pl. 12; Britt. & Brown, Ill. Fl. f. 4003; ed. 2. f. 4576. 
22. Artemisia pedatifida Nutt. Trans. Am. Phil. Soc. II. 7: 399. 
1841. 
A cespitose undershrub, with a thick woody caudex, 1-1.5 cm. high; branches erect, finely 
canescent; leaves 1-2 cm. long, ternately or the lower sometimes bi-ternately divided into 
linear to linear-spatulate short divisions, strigose-canescent; those of the inflorescence often 
entire; heads racemose, short-peduncled or subsessile, erect, heterogamous; peduncles 0-10 
mm. long; involucre hemispheric, 2.5 mm. high, 3-4 mm. broad; bracts 5-7, in 2-3 series, 
rounded-oval, obtuse, densely canescent; ray-flowers 5-7; corollas 2 mm. long; achenes nearly 
2 mm. long; disk-flowers 5-7; corollas rose-purple at the summit, narrowly funnelform, 3.5 mm. 
long; style tapering gradually from the 2-cleft summit. 
Tyre Locauity: Arid plains of Lewis River [Snake River, Idaho]. 
DistreiutTion: Wyoming, Montana, and Idaho. 
Subgenus B. ABSINTHIUM 
Heads heterogamous. Marginal flowers pistillate; corollas subcylindric, 2-3-toothed, 
tapering upwards. Disk-flowers hermaphrodite, fertile; corolla deeply campanulate or 
elongate-funnelform, 5-toothed. Style in both 2-cleft, in the ray-flowers usually decidedly 
