164 UNIVERSITY OF COLORADO STUDIES 



Systematic List by Families — Continued 



Mertensia lateriflora Greene Compositae 



Oreocarya pulvinata A. Nels. Antennaria parvijolia Greene 



Scrophulariaceae Arnica cordijolia Hook. 



Castilleja conjusa Greene Erigeron compositus Pursh. 



Cashlleja rhexijolia Rydb. Erigeron salsuginosus (Richardson) A. 



Castilleja sulphurea Rydb. Gray 



Elephantella groenlandica (Retz.) Rydb. Erigeron salsuginosus glacialis (Nutt.) 



Pedicularis grayi A. Nels. A. Gray 



Pedicularis parryi A. Gray Erigeron trifidus Hook. 



Pedicularis racemosa Dougl. Chrysopsis Joliosa Nutt. 



Pedicularis scopulorum A. Gray. Machaeranthera varians Greene 



Pentstemon alpinus Torr. Senecio mutabilis Greene 



Pentstemon glaucus stenosepalus A. Gray Senecio perplexa A. Nels. 



Pentstemon procerus Dougl. Senecio purshianus Nutt. 



Veronica wormskjoldii R. & S. Senecio triangularis Hook. 



Caprifoliaceae Solidago decumbens minuescens A. Nels. 



Lonicera involucrata Banks Tetraneuris lanata (Nutt.) Greene 



Sambucus microbotrys Rydb. Cichoriaceae 



Campanulaceae Crepis glaucella Rydb. 



Campanula petiolata DC. Crepis perplexa Rydb. 



Compositae Crepis petiolata Rydb. 



Achillaea lanulosa Nutt. Taraxacum montanum Nutt. 



It will be noted from the systematic list that the families represented 

 by a considerable number of species are: Gramineae, 8 species; Cyper- 

 aceae, 6 species; Salicaceae, 5 species; Ranunculaceae, 8 species; 

 Saxifragaceae, 6 species; Rosaceae, 8 species; Papilionaceae, 7 species; 

 Gentianaceae, 10 species; Scrophulariaceae, 12 species; Compositae 

 (excluding Chicoraceae) , 15 species. The Polypodiaceae, Liliaceae 

 and Labiatae, although distributed in Colorado all the way from the 

 plains to alpine regions, are not represented in the Redrock Lake flora. 

 The Solanaceae and Euphorbiaceae, so common and conspicuous in the 

 plains and foothills, do not ascend to the altitude of Redrock Lake. 



Altitudinal Range of Species 1 



It is worth noting that while a larger number of the species of 

 the sedge zone range up, the species of the forest zone for the most part 

 range down. This relation is evidently due to the difference in the 



« For an exhaustive discussion of the altitudinal distribution of Colorado alpine plants as revealed by the 

 statistics and locality records in Rydberg's Flora the reader is referred to the "Alpine Flora of Colorado' 

 by Professor T. D A. Cockerell in The American Naturalist, Vol. XL, pp. 861-73, 1906. 



