STUDIES IN LAKE AND STREAMSIDE VEGETATION l6l 



Autumn Aspect: August 15 to October i. List of Prominent Species 



Plants of Lake Zone 

 Sparganium angustifolium (fruit) Nymphaea polysepala (fruit) 



Plants of Sedge Zone 

 Carex spp. (fruit) Amarella monantha 



Dasystephana romanzovil Chondrophylla americana 



Pleurogyne fontana 



Plants of Shrub Zone 

 Salix spp. Anthopogon elegans 



Betula glandulosa (fruit) Dasystephana parryi 



Plants of Forest Zone 

 Picea engelmanni (fruit) Abies lasiocarpa (fruit) 



Pinus tnurrayana (fruit) Amarella scopulorum (Dasiphora society) 



Pinus flexilis (fruit) Dasystephana parryi (Dasiphora society) 



VI. Floristics and Distribution 



General Account.— The knowledge of the flora of Redrock Lake 

 has been gained by collections and observations extending through two 

 growing seasons. The experience of the writers in the present study 

 has shown the inadequacy of collections and observations made for 

 ecological purposes during one growing season only, even in such a 

 restricted area as Redrock Lake. Not only does the field worker fail 

 to see all the first time over the area, but the differences in the meteor- 

 ological conditions from year to year influence the details in the vegetation 

 and it is only by several seasons' observations that completeness is 

 reached. 



For convenience, and for purposes of comparison and reference, the 

 species collected by the writers are listed both systematically and by 

 zones. 



The tables and discussions of distribution are intended to give to 

 some extent the wider relations of the flora of Redrock Lake. The 

 herbarium specimens have been arranged by zones, a different colored 

 label being used for each zone. 



The altitude and the flora of the area studied place it at about the 

 lower limit of the sub-alpine zone 1 as recognized by the writers. From 

 a consideration of the plants present, it seems to be in the middle of 



1 Rulaley, Francis, "Plant Zones in the Rocky Mountains of Colorado," Science, n. s.,Vol. XXVI, pp 

 642, 643, 1907. 



