STUDIES IN LAKE AND STREAMSIDE VEGETATION 



l6 5 



amount of precipitation and general moisture conditions which prevail 

 in high and low altitudes. Of the entire flora of Redrock Lake, a 

 greater proportion of the species range down than range up. A list of 



TABLE v 

 Percentage of the Species of Each Zone Belonging to Different Altitudes 



Zone 



Lake 



Sedge 



Shrub 



Forest 



Entire flora. 



Ranging 



Both Up 



and Down* 



Ranging 

 Upt 



Per cent. 

 60 

 44 

 68 

 60 

 62 



Per cent. 



33 

 16 



Ranging 

 DownJ 



Per cent. 

 40 



23 

 16 



33 

 27 



* For the most part montane and sub-alpine plants. 



t For the most part alpine and sub-alpine plants. 



t For the most part montane and foothill plants with some from the plains region. 



the species which have the altitude of Redrock Lake either as their 

 upper or lower limit of distribution is as follows : 



High-Altitude Plants Which Seldom Extend in Colorado to Altitudes Lower 



than That of Redrock Lake 



Sedge Zone 



Dasystephana romanzovii 

 Pedicularis scopulorum 



Agroslis tenuiculmis 

 Sedum rhodanthum 

 Chondrophylla americana 



Arenaria sajanensis 

 Sibbaldia procumbens 



Eritrichium argenteum 



Shrub Zone 



Sieversia turbinate* 



Forest Zone 



Solidago decumbens minuescens 



Lower-Altitude Plants Which Seldom Extend in Colorado to Altitudes Higher 



Batrachium flaccidum 



Car ex siccata 

 Carex utriculata 

 Ranunculus reptans 



Equisetum arvense 

 Salix bebbiana 

 Streptopus amplexijolius 



than That of Redrock Lake 



Lake Zone 



Sedge Zone 



Crepis perplexa 

 Crepis petiolata 

 Taraxacum montanum 



Shrub Zone 



Atragene occidentalis 

 Dasiphora fruticosa 

 Castilleja sulphurea 



