A. PATTERSONI. 



113 



dwarfs are found in the La Sal Mountains of Utah (Rydberg and Garrett 8075) and on 

 Gray's Peak, Colorado {Shear 4997). A. pattersoni is not an altitudinal variant of scopu- 

 lorum, as is indicated also by the occurrence of both within a few feet of each other 

 without the presence of intergrading forms. Thus on Pike's Peak, at a point about 1 km. 

 south of Windy Point, but still well above timber-line, one may find small areas where 

 only scopulorum grows, while only 4 meters removed there are areas of pure pattersoni, 

 the intervening space being occupied by other plants. 



The morphological differences between these two species are indicated in table 9. As 

 there shown, they exhibit not only well-marked divergent tendencies in some characters, 

 but in one of these there is also an absence of overlapping. Thus, the number of disk- 

 flowers runs from 10 to 31 for scopulorum, with an average of 18, while pattersoni has 32 

 to 130, with an average of 85. P'urther examinations might exhibit an overlapping, but 

 on the other hand, the lowest counts in both cases are probably due to the dropping out of 

 some of the flowers before the counts were made. Attention is also called to universally 

 pubescent corollas of scopulorum as contrasted with the almost constantly glabrous ones 



Table 9. — Statistical comparison between the characters of Artemisia scopulorum and A. pattersoni. 



No. of 



heads per 



plant 



No. of 

 bracts. 



No. of 

 ray- 

 flowers. 



No. of 

 disk- 

 flowers. 



Total 

 flowers. 



CoroUa- 

 lobes. 



A. leopulorum: 



Pike's Peak, Colo. 



Pike's Peak, Colo. 



Pike's Peak, Colo 



Seven Lakes, Colo 



Gray's Peak, Colo 



La Plata Mountains, Colo 



Mineral County, Colo 



Vallecito, N. M 



Medicine Bow Mountains, Wyo. 



Big Horn Mountains, Wyo 



Wind River Mountains, Wyo . . . 

 Spanish Peaks, Mont 



Average . 



A. paltertoni: 



Pike's Peak. Colo. 



Do 



Baldy Peak, Colo.. 

 Gray's Peak, Colo. 

 Baldy. N. Mei.... 



11077 CI 

 Do.... 



Do 



Do 



Do 



11078 CI 



Do 



Do 



Do.... 

 Do.... 



11080 CI 

 858541 US 

 488933 US 

 337427 US 

 892761 US 

 489803 US 

 433965 US 

 253360 US 

 203786 US 

 416310 US 



11076 CI 



Do 



Do 



Do 



Do 



11079 CI 



Do 



Do 



Do 



Do 



Do 



CI 



A29 CI 



CI 



593762 US 



738710 US 



22 



16 



15 



6 



15 



18 



13 



25 



22 



15 



13 



10 16 



5 10 



12 18 



15 



12 



9 11 



7 9 



7 11 



9 15 



14 



17 17 

 14 10 

 14 12 



14 12 

 16 12 



15 14 

 12 12 

 12 12 



16 13 

 12 14 

 14 15 



18 

 13 

 13 

 11 

 13 

 15 

 16 

 14 

 12 



11 13 



10 9 



8 7 



11 6 

 6 6 

 6 7 

 6 7 

 6 6 



9 7 



23 17 

 13 10 

 21 18 



18 16 



19 13 



17 17 

 12 10 

 21 17 

 26 20 



20 19 



18 18 

 31 

 10 

 22 

 26 

 19 

 25 

 24 

 25 

 22 



13 



20 



32 



12 22 



15 24 



15 30 



29 



21 



15 24 



17 27 



19 



27 



25 



17 



20 



8 15 



11 22 



11 27 



19 



20 



7 15 



7 16 



19 



20 



15 



10 



16 



23 



11 



10 



Average . 



115 



40 101 



38 82 



43 119 



130 



99 



32 86 



45 104 



79 



128 



106 



46 



57 



65 



87 



67 



85 



34 30 

 23 19 

 29 25 

 29 22 

 25 19 

 23 24 

 18 17 

 27 23 



35 27 

 27 28 

 25 25 



39 

 17 

 28 

 34 

 26 

 34 

 31 

 32 

 31 



26 



» 135 



48 116 



49 104 

 54 146 



149 

 119 

 39 101 

 52 120 

 98 

 148 

 121 

 56 

 73 

 88 



Pubescent. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Glabrous. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Pubescent. 

 Glabrous. 



Do. 



Do. 



