A. TRIDENTATA. 

 Table 14. — Variation in the svbspeeies of Artemisia tridentata — Continued. 



147 



No. of 

 flowers 

 per head. 



Subspecies trifida: 



South of Laramie, Wyo 



Do 



Do 



Teton Forest, Wyo 



Yellowstone, Wyo 



Near Strevell, Idaho 



Madison. Mont 



Cascade Mountains, Wash 



Oroville, Wash 



Rattlesnake Mountains, Wash. 

 Eastern Oregon 



Average . 



Subspecies arhuscula: 



Yakima Region, Wash 



Crook County. Oreg 



Lake County, Oreg 



Eastern Oregon 



Silver Lake, Oreg 



Placer County, Calif.' 



Hayden Flats, Routt County, Colo . 

 Eldorado County, Calif 



Average . 



Subspecies rothrocki: 



Mount Olancha, Calif 



Tioga Pass, Calif 



San Bernardino Mountains, 



Inyo County, Calif 



Mount Dana, Calif 



Do 



California 



Middle California 



Mariposa County, Calif. . . 



Camas Prairie, Idaho 



Red Cliff, Colo* 



North Park, Colo.< 



Slide Mountain, Nev 



Washington' 



Union County, Oreg 



Type specimen 



Cooper Hill, Wyo 



Crested Butte, Colo.« 



Yakima Region, Wash. . . . 

 Wallowa Mountains, Oreg. 



Placer County, Calif 



Truckee, Calif 



Average . 



CI 

 CI 

 CI 



NY 



NY 



CI 



NY 



172638 UC 



175975 UC 



NY 



29793 UC 



172649 UC 



176735 UC 

 175219 UC 



176736 UC 

 176784 UC 

 202223 UC 



NY 

 205842 UC 



47383 US 



203183 UC 



101098 UC 



202294 UC 



29666 UC 



29806 UC 



34702 UC 



91185 UC 



29710 UC 



231676 US 



NY 



NY 



NY 



NY 



NY 



Phila. 



146493 UC 



34512 UC 



173161 UC 



29788 UC 



193453 UC 



193454 UC 



4.0 

 4.1 

 4.1 

 4.1 

 4.0 

 4.0 



4.0 

 4.2 

 3.5 

 4.2 

 4.1 

 5.0 

 4.0 

 5.0 

 4.6 

 4.5 

 3.2 

 3.5 

 2.7 

 3.0 

 2.8 

 4.0 

 3.3 

 3,7 

 3.0 

 3.0 

 3.2 

 2.7 



11 13 

 8 12 

 16 14 



8 10 

 10 10 

 10 10 



8 8 

 10 12 

 10 12 



11 



12 



11 13 



12 14 

 14 14 



10 12 



11 14 



12 12 

 12 13 



13 



9 10 

 11 8 



7 10 

 13 12 

 13 14 

 13 16 



9 10 



7 8 

 2 13 



8 11 



8 10 

 10 10 

 18 20 



12 13 



13 13 



9 10 

 9 10 



2.3 

 2.0 

 2.3 

 2.4 

 2.5 

 2.3 

 2.0 

 2.0 

 2.2 

 Young 



2.6 

 2.8 

 Young 

 2.4 

 3.0 

 3.3 



2.4 

 2.7 

 3.0 

 2.9 

 2.9 

 2.8 

 2.5 

 2.8 

 2.8 

 2.8 



' Dwarf forms. 



' Type collection of A. parishi Gray. 



• Minor variation 10. 



' Minor variation 7, A. spidformia Osterhout. 



' Type of A. taaeyana Rydberg, minor variation 18. 



as the most primitive of all the subspecies, but it is not the beginning of A. tridentata, 

 as seems evident from its lack of connection, either morphologically or geographically, 

 with A. bi^eZow, which, as previously shown (pp. 104, 142), seems to represent the ancestral 

 type from which this collective species has sprung. Whatever its previous history, 

 rothrocki is now a readily distinguished type, restricted in distribution to a few widely 

 separated localities, all within the general area of typica, but near its uppermost limits 



