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flowers had the apical half of the sepals purplish. In 

 western Europe, the species of Cheirinia have yellow 

 flowers, so that this character is one of those used to 

 conveniently separate the genus from Cheiranthus, which 

 ranges through the same colors as Cheirinia Cockerelliana. 



11. Sedum stenopetalum ruhrolineatum Cockerell, 1891. This 



strongly reddened form is the phase of the species regu- 

 larly occupying high altitudes; extremely abundant from 

 Longs Peak Inn to timber line, affording food to the larva 

 of the beautiful butterfly Parnassius. I brought a couple 

 of plants to Boulder, to grow in the garden, to see 

 whether the red color is permanent at a lower altitude, 

 though I can hardly doubt that it will prove so. This 

 appears to be identical with 5. subalpinum Blankinship, 

 1905, which is said by that author to occur in "alpine 

 and subalpine situations," "passing below into 5. steno- 

 petalum." I do not think it can possibly be regarded as 

 a distinct species, and in this opinion I have the support 

 of Dr. N. L. Britton (litt., Oct., 1905). It is, however, 

 a good race. 



12. Dry as octopetala L. This beautiful plant was found in 



abundance at and above timber line, looking just as it 

 did when I found it some years ago on the top of the Rigi, 

 in Switzerland. 



13. Primula angustifolia Torrey. Common above timber line. 



This Is an excellent example of a permanently modified 

 alpine plant. By the form of the seed capsule and leaves, 

 this falls in a different section of the genus from P. Parryi 

 of the Hudsonian Zone in Colorado. It is in fact an 

 isolated species in the Rocky Mountain Flora, nearest to 

 P. Cusickiana of Oregon, and more or less related to the 

 Old World P. nivalis. 



14. Androsace carinata Torrey. Abundant above timber line. 



Coulter says the corolla is white with a yellowish eye, and 

 this is true of half or more of the plants; but a very 

 common phase has the "eye" bright pink. Our plants 

 were studied in the exact type locality of Douglasia John- 



