282 UNIVERSITY OF COLORADO STUDIES 



Principal species: 



J uncus ballicus Aragallus richardsonii 



Artemisia canadensis Aragallus lambertii 



A renaria fendleri A chillaea lanulosa 

 Sedum stenopetalum 



Station No. 8. — ^Lodgepole-pine forest. Slope 15 degrees. Exposure due 

 south. This station lies just opposite to and at the same elevation as No. i. 

 The forest floor is covered with duflf. The formation is open but the trees are 

 so high that the ground is well shaded. 



Facies — Lodgepole-pine {Pinus murrayana). 



Principal species: 



Juniperus sibirica Arnica cordifolia 



Vaccinium caespitosum Rosa woodsii 



Secondary species: 

 Antennaria aprica Calamagrostis canadensis 



Carex sp. 



Station No. g. — Aspen grove. Slope 20 degrees. Exposure 10 degrees east 

 of south. This station lies somewhat above and to the west of No. 8. The 

 grove is thick and a herbaceous growth covers the floor. The soil is rich with 

 considerable hiimus. There is some seepage from the mountain side. 



Facies — Populus iremuloides. 



Principal species: 



Geranium richardsonii Bromus porteri 



Thermopsis divaricarpa Agropyron caninum 



Carduus pulchellus Calochortus gunnisonii 



Prunus melanocarpa Campanula petiolata 



Campanula petiolata Achillaea lanulosa 



Station No. 10. — Sagebrush ridge. Slope 30 degrees. Exposure due south. 

 It is much drier than the surrounding areas. The soil is hard and gravelly. 

 Facies — Artemisia tridentata. 

 Principal species: 



Rosa woodsii Gaillardia aristata 



Campanula petiolata Eriogonum subalpinum 



Aragallus lambertii Calochortus gunnisonii 



Sedum stenopetalum Prunus melanocarpa 

 Astragalus alpinus 



