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. patter soni 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. Further 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. 



Herbarium. 



No. of 

 heads per 



No. of 

 bracts. 



No. of 



ray- 



flowere. 



No. of 

 disk- 

 flowers. 



Total 

 flowers. 



Corolla- 

 lobes. 



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 . 



Do 



Baldy Peak, Colo. . 

 Gray's Peak, Colo. 

 Baldy, N. Mei.... 



Average 



11077 CI 

 Do.... 

 Do.... 

 Do.... 

 Do.... 



11078 CI 

 Do.... 

 Do.... 

 Do.... 



Do. 



11080 CI 



858541 US 



488933 trS 



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 



15 

 13 



10 16 

 5 10 



12 18 

 15 

 12 



7 9 

 7 11 

 9 15 



17 17 

 14 10 

 14 12 



14 12 

 16 12 



15 14 

 12 12 

 12 12 



16 13 

 12 14 

 14 15 



18 



23 17 

 13 10 

 21 18 



18 16 



19 13 

 17 17 

 12 10 

 21 17 

 26 20 



32 

 12 22 

 15 24 

 15 30 

 29 

 21 

 15 24 

 17 27 



8 15 

 11 22 

 11 27 

 19 

 20 

 7 15 

 7 16 



34 30 

 23 19 

 29 25 

 29 22 

 25 19 

 23 24 

 18 17 

 27 23 



35 27 

 27 28 

 25 25 



Pubescent. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Pubescent. 

 Glabrous. 



