i6o 



UNIVERSITY OF COLORADO STUDIES 



noted above spring begins about May 15. At this time there appear a 

 few plants such as Trollius, Caltha, Erysimum, Arenaria and Eri- 

 trichium. Most of these continue to blossom well into the summer 

 season also. 



'Spring Aspect: May 15 to July i. List of Prominent Species 



Plants of the Sedge Zone 

 Caltha leptosepala Trollius albiflorus 



Plants of the Shrub Zone 



Betula glandulosa 

 Viola bellidifolia 



Salix chlorophylla 

 Salix bebbiana 

 Salix glaucops 

 Salix lutea 



Picea engelmanni 

 Pinus flexilis 

 Pinus murrayana 

 Abies lasiocarpa 



Summer Aspect. 



Viola blanda 



Plants of the Forest Zone 



Eritrichium argenteum 

 Arenaria sajanensis 

 Aragallus multiceps minor 

 Erysimum wheeleri 



-The summer lasts from July 1 to August 15 and 

 is characterized by the blooming of the water lilies (Nymphaea poly- 

 sepala) . 



Summer Aspect: July i to August 15. List of Prominent Species 



Plants of Lake Zone 



Nymphaea polysepala 

 Plants of the Sedge Zone 



Caltha leptosepala 

 Dasiphora fruticosa 

 Elephantella groenlandica 



Sparganium angustifolium 



Carex spp. 

 Sedum rhodanthum 

 Dodecatheon pauciflorum 

 Poa reflexa 



Plants of the Shrub Zone 



Erigeron salsuginosus glacialis 

 Caltha leptosepala 



Salix spp. (fruit) 

 Betula glandulosa (fruit) 

 Pedicularis racemosa 



Plants of the Forest Zone 

 Picea engelmanni (young cones) Vaccinium oreophilum 



Pinus murrayana (young cones) Campanula petiolata 



Pinus flexilis (young cones) Sedum stenopetalum 



Abies lasiocarpa (young cones) Thermopsis arenosa 



Autumn Aspect. — The autumn aspect is characterized by the gentians. 

 By this time the water lilies are through blooming and the fruit is devel- 

 oping, seldom becoming ripe until September 1 or later. 



