870 



THE AMERICAN NATURALIST 



[Vol. XL 



The Campanula and Achillea are offshoots from Old World 

 types, and were until recently considered identical with them. 



(6) Species not going north of the British Boundary (32 



Blepharineuron tricholepis (Torrey) . 



(To Mexico.) 

 Poa longipedunculata Scribn. 

 P. pratericola Rydb. & Xash. 

 P. buckleyana Xash. 

 Eriogonum umbellatum Torrey. 

 -Cerastium pilosum Greene. (Colo. 



only.) 



C. oreophilum Greene. (To Cali- 

 fornia.) 

 Armaria confusa Rydb. 

 Silme halUi S. Wats. 

 Aquilegia coerulea James. 

 Erysimum wheeleri S. Wats. 

 Henchera hallii A. Gray. (Colo. 



Mirninthes rhomhijolia (Greene). 

 Rtlus icolfii Rothr. 

 Drymocallis fissa (Nutt.). 



(Greene). 



Gayophytum racemosum T. & Q. 

 Polemonium hrandcgei (A. Gray). 



(Colo, only.) 

 Phacelia alpina Rydb. 

 Mertensia pratensis Heller. 

 M. viridula Rydb. (Colo, only.) 

 Besseya ritteriana (Eastw.). (Colo. 



only.) 



Samhucus microbotrys Rydb. 

 Chrysopsis arida A. \els. 

 Oreochrysum parryi A. Gray. 

 Erigeron glandulosus Porter. 

 E. superbus Greene. (Colo, only.) 

 Dugaldia hoopesii (A. Gray). 

 Arnica monocephala Rydb. 

 Senecio pudicus Greene. (Colo, only.) 

 Carduus oreophilus Rydb. (Colo, 

 only.) 



Agoseris agrestis Osterh. (Colo, 

 only.) 



Taking the whole list of species which reach 12,000 feet, arranged 

 in systematic order, we note many points of interest. 



(1) There is only one fern, a circumpolar species. 



(2) The grasses number 33, of which four are circumpolar, but 

 others are vers^ close to Old-World types. There is an appreciable 

 element of endemic alpine grasses. 



(3) The Cyperaceffi number 20, of which 11 reach the Old 

 World. All but one (Klyna) belong to Carex. 



very iiiterestiii- accnunt of the allies of J nnroidrs spicatum in 

 Afru'U. see Ki.^^l.Tin .1////. /^/.,()et., 1<)()4. 



(.")) Ill rormlaeae* ;e, the peculiar alpine Claytonia megarrhiza 

 is noteworthy. It iielongs to a distinct subgenus which ranges 

 from Asia into our lloeky Mountains. 



(G) The Alsinaceic are numerous (18 species); one {Sagina 



