i66 



UNIVERSITY OF COLORADO STUDIES 



Selaginella densa 

 Selaginella underwoodii 

 Blitum capitatum 

 Potentilla concinna 

 Rosa sayi 



Aragallus multiceps 

 Astragalus sulphur escens 

 Thermopsis arenosa 



Lower- Altitude Plants — Continued 



Forest Zone 



Viola blanda 



Chamaenerion angustijolium 

 Heracleum lanatum 

 Mitella stenopetala 

 Pentstemon alpinus 

 Erigeron compositus 

 Senecio mutabilis 

 Crepis perplexa 



Extensions of Altittjdinal Range 



The following list gives an extension of the altitudinal range of species 

 given by Rydberg in his Flora of Colorado. The range as stated by 

 Rydberg is placed in parentheses. Only two of these are downward 

 extensions. The others are all species hitherto reported only from lower 

 altitudes. 



Selaginella densa 

 Selaginella underwoodii 

 Zannichellia palustris 

 Hierochloe odorata 

 Atragene occidentalis 

 Dasystephana romanzovii 

 Dodecatheon pauciflorum 

 Eritrichium argenteum 

 Lonicera involucrata 

 Erigeron compositus 

 Machaer anther a varians 

 Senecio mutabilis 

 Crepis glaucella 

 Crepis perplexa 

 Crepis petiolata 

 Taraxacum monatum 



up to 10,100 ft. (7,00c) 1 

 5.000-10,100 ft. (7,500) 

 4,000-10,100 ft. (9,000) 

 6,500-10,100 ft. (8,500) 

 5,000-10,100 ft. (7,000) 

 (11,000) 10,100-14,000 ft. 

 up to 10,100 ft. (8,500) 

 (11,000) 10,100-14,400 ft. 

 7,000-10,100 ft. (9,000) 

 8,000-10,100 ft. (9,000) 

 6,000-10,100 ft. (8,000) 

 5,000-10,100 ft. (9,000) 

 up to 10,100 ft. (7,500) 

 5,000-10,100 ft. (9,000) 

 7,000-10,100 ft. (9,000) 

 up to 10,100 ft. (9,500) 



From Table VI, computations in percentages show that while 

 100 per cent, of the families and 91 per cent, of the genera represented 

 at Redrock Lake are common to North America, Europe and Asia, 

 70 per cent, of the species are found in North America only and 60 per 

 cent, of the species are found exclusively in western North America. 



1 Cooper, William S., "Alpine Vegetation in the Vicinity of Long's Peak, Colorado," Bol. Gaz., Vol. 

 XLV, pp. 310-37, May, 1908, reports this species from alpine regions. 



