A. ABSINTHIUM. 



107 



toothed; disk-flowers 30 to 50, fertile, corolla campanulate, about 1.5 to 2 mm. long, 

 5-toothed, glabrous; style-branches spreading, those of the disk-flowers truncate and 

 penicillate at the ends; achenes nearly cylindric, but narrowed at base and slightly 

 rounded to the summit, smooth, glabrous. 



Native of Europe, thoroughly established as an introduced wayside plant in eastern 

 Canada and northern New England; less common from North Carolina to Utah, eastern 

 Washington (where spreading rapidly), central Oregon, and British Columbia. Type 

 locality, Europe. Collections: Near Topsail, Conception Bay, Newfoundland, Howe 



I /p./?3//srsa7/\ 



\ (Siberian) I 

 \ «- 



\ / 



Glabrous. 

 Old World 



Heads i-s, 

 5-7 mm. broad 

 disk-fls. jo-12 



Herbaceous; 

 racemose or solitary 

 Ivs. silvery. American 



Lf.-segments 

 broad; plants tall 



FiQ. 14. — Phylogenetic chart of the speciea of Artemisia section Ahtinthium. 



and Lang 121 J^. (Gr, NY); Brome, Quebec, Fmse ISll (Or); Plevna, Ontario, August 14, 

 1902, Fowler (Gr); Veazie, Maine, July 31, 1891, Fernald (Gr); Milford, Connecticut, 

 Williams 5539 (Gr); Morristown, New York, Phelps 1767 (Gr); Brookings, South 

 Dakota, September, 1893, Thornber (UC); Yellow Bay, Montana, Butler 470 (NY); 

 Medicine Hat, Assiniboia, Macoun 10980 (Gr); Salem, Oregon, J. C. Nelson 2395 (Gr, 

 US). 



RELATIONSHIPS. 

 This differs from the native members of its section in the much more robust habit 

 and ample foliage. It is never decidedly woody at the base, as is usually true of A. 

 frigida, and the profuse leafy panicle at once distinguishes it from A. scopulorum. 

 However, in technical characters it is very close to both of these, thus lending support 

 to the view that the section Absinthium is a natural group, even though its members 

 are few and widely separated geographically. Outside of the members of its own section, 

 it is most nearly like the native A . franserioides, of the southern Rocky Mountains. 



