A. VULGARIS. 



95 



ludovidana, because of the entire margins and other characters (Glenwood, Minnesota, 

 August, 1891, Taylor, UC). While the principal leaves of these are entire, the lower 

 exhibit remote and irregular dentations not at all comparable to the even serratures of 

 serrata. It seems, therefore, that, while this is an especially distinct form, and although 



Fio. 12. 

 Variation in outline of leaves of ArUmisia vulgaris 

 gnaphalodes. The three leaves in each vertical row are 

 from a single plant; the lowest leaf in each column is 

 from near the base of the stem, the middle leaf from 

 somewhat above midway of the stem, the highest leaf 

 from the lower part of the inflorescence. All three 

 plants were growing within 100 m. of one another near 

 Golden, Colorado. The plant with leaves shown in 

 first column was in loose soil with rank vegetation; the 

 others on higher slopes, the soil hard and stony, the 

 surrounding vegetation less rank. All of the leaves are 

 densely tomentose beneath and scarcely less so above. 

 Plant at left would be classed as Artemisia britloni 

 (minor variation 6) and plant at right as A. gnaphalodes 

 by those who use leaf characters as specific criteria. 

 All X 0.4. 



its exact origin can not now be traced, its connection with subspecies ludovidana and 

 gnaphalodes is sufficiently well established to justify its reduction to a subspecies of this 

 group. (See fig. 13, p. 96.) 



Close to ludovidana but usually recognized by its more reduced, spike-like inflorescence, 

 is subspecies lindleyana. The plants of this are often quite woody at the base. Here 



