COMPOSITAE (composite FAMILY) 849 



generally glabrous, (jroon; root perennial. — Calcareous rocks, Nfd. to B. C, s. 

 to n. N. E., Minn., etc. (Ku.) 



3. A. borealis Pall. Similar, 1-3 dm. high; lower leaves l-2-ternately 

 divided; upper linear, mostly entire; heads fewer, subracemose; involucre 

 pilose or glabrate, brownish; root perennial. — Arctic regions, s. to the serpen- 

 tine mts. of e. Que., Keweenaw Point, Mich., Col., and Wash. (Asia.) 



* * Leaves entire or some S-cleft. 



4. A. dracunculoides Pursh. Tall (0.5-1.5 m.), somewhat woody at base, 

 slightly hoary or glabrous; leaves narrowly linear and entire or the lower 

 o-cleft ; heads small and numerous, panicled. — Sandy banks and prairies, 

 Man. to 111., Mo., westw. and south westw^ 



5. A. glaiica Pall. Strict, 3-6 dm. high, somewhat woody at base, minutely 

 silky-pubescent or glabrate and glaucous ,- leaves linear- to oblong-lanceolate; 

 heads as in the preceding. — Prairies, Sask. to Minn, and N. Dak. (Siber.) 



§ 2. Beceptacle smooth ; flowers all fertile^ a few pistillate, the others perfect. 



Two cultivated shrubby species, from Europe, with filiformly divided leaves, 

 have occasionally escaped from gardens and become spontaneous, viz. A. 

 Abhotan'um L. (the Southernwood), of strict habit, with 1-2-pinnatiM leaves 

 and pubescent heads ; and A. PR(k'ERA Willd., with more spreading branches, 

 all the leaves finely 2-pinnatifid, and heads glabrous. 



* Branching perennials, ivhitened with fine and close-pressed wool ; heads small, 



in leafy panicles. 



6. A. serrata Nutt. Very leafy, 1.5-3 m. high ; leaves lanceolate or the 

 upper linear, serrate, white-tomentose beneath, green above ; heads greenish, 

 subcylindric, 4.3 7nm. long or less. — 111. to S. Dak.; sparingly naturalized 

 eastw. 



7. A. longifolia Nutt. Stem 0.5-1.5 m. high ; leaves linear or linear-lanceo- 

 late, entire, usually glabrate above ; heads subcylind.ric, canescent, 4-6 mm. long. 

 — Minn, to Neb., and westw. 



8. A. ludoviciana Nutt. (Western Mugwort, White Sage.) Whitened- 

 icoolly throughout ; leaves lanceolate, the upper mostly entire, the low^r usually 

 cut-lobed, toothed or pinnatifid, the upper surface sometimes glabrate and 

 green ; heads campanulate. mostly sessile in slender panicles. (Including A. 

 gnaphalodes Nutt.) — Dry banks, Sask. to Mich., 111., Tex., and westw.; locally 

 naturalized eastw. — Veiy variable. 



9. A. vulgXris L. (Common Mugwort.) Tall; leaves mostly glabrous and 

 green above, the lower surface (and the branches) white-w^oolly, all pinnatifid, 

 with the divisions often cut-lobed, linear-lanceolate ; heads small, in open pani- 

 cles. — Waste places and roadsides, and along streams, e. Que. to Ont. and Pa. 

 (Nat. from Eu.) 



10. A. kansXna Britton. Low, 1-6 dm. high ; leaves finely pinnatifid into 

 linear segments; heads densely woolly, in strict close panicles. — Plains and 

 foot-hills, w. Kan., Col., and N. Mex. ; adventive eastw. 



* * Densely white-tomentose, perennial; heads large, racemose-glomerate ; invo- 



lucral bracts herbaceous. 



11. A. StelleriXna Bess. (Beach W., Dusty Miller, Old Woman.) 

 Stout, 3-6 dm. high, from a creeping base ; leaves obovate or spatulate. pin- 

 natifid, the lobes obtuse. — Sandy sea-beaches, e. Que. to N. J., and shores ot 

 Oneida L., N. Y. (Haberer); commonly cultivated in old gardens, and recently 

 spreading extensively to sandy soil. (Introd. from n. e. Asia.) 



* * * Less branched, biennial or annual, glabrous. 



12. A. biennis Willd. Strict, tall ; lower leaves 2-pinnately parted, the 

 upper pinnatifid ; lobes linear, acute, in the lower leaves cut-toothed ; heads in 

 short axillary spikes or clusters, crowded in a slender and glomerate leafy 

 panicle. — Gravelly banks, 0. to Tenn., Mo., and noithwestw. ; now established 

 eastw. by railroads and in waste places. 



gray's manual — 54 



