28o UNIVERSITY OF COLORADO STUDIES 



with ecological data. Situations were chosen, as far as possible, 

 which* represented all of the characteristic conditions in the park- 

 No. I is at the south and No. lo well to the north of the Park. Their 

 positions are shown in the map (Fig. 2). 



List of Stations 



No. I. Lodgepole-pine forest, north exposure. 



•No. 2. Railway cut, north exposure. 



No. 3. Railway cut, south exposure. 



No. 4. Dry grassland (flat). 



No. 5. Meadow (moderately moist grassland). 



No. 6. Willow scrub. 



No. 7. Dry grassland, north exposure. 



No. 8. Lodgepole-pine forest, south exposure. 



No. 9. Aspen grove. 



No. 10. Sagebrush ridge. 



Station No. i. — ^Lodgepole-pine forest. Slope 17 degrees. Exposure 14 

 degrees east of north. The formation is rather open and the earth has no covering 

 either of herbaceous growth or of humus. The soil contains considerable gravel 

 and is only moderately compact. Moisture varies little between surface and sub- 

 soil. 



Facies — Lodgepole pine, Pinus murrayana. 

 Abies lasiocarpa Erysimum wheeleri 



Populus tremuloides Chamaenerion angustifolium 



Pinus flexilis Castilleja sulphur ea 



Picea engelmanni Car ex filifolia 



Thermopsis divaricarpa 



Station No. 2. — Six-year-old railroad cut. Slope 30 degrees. Exposure 

 15 degrees west of north. It has a very scanty covering of herbaceous growth. 

 The surface soil is much drier than that found lower down. 



Principal species: 

 A ragallus richardsonii A rtemisia frigida 



Artemisia canadensis Achillaea lanulosa 



Station No. 3. — Six-year-old railroad cut opposite No. 2. Slope 27 degrees. 

 Exposure 14 degrees west of south. The vegetation is a little heavier than on 



