ECOLOGICAL CROSS-SECTION OF BOULDER PARK 251 



the opposite bank, possibly on account of the more compact condition of the 

 soil, which is more gravelly. Surface soil and subsoil differ little in moisture. 



Principal species: 

 Artemisia canadensis Gaillardia aristata 



Agropyron caninum Artemisia frigida 



Chrysopsis foliosa Achillaea lanulosa 



Station No. 4. — Flat grassland. The soil is compact and gravelly, containing 

 but little more moisture in the subsoil than near the surface. 



Fades — Koeleria cristata. 



Principal species: 

 J uncus halticus Aragallus lamhertii 



Sedum stenopetalum Aragallus richardsonii 



Arenaria fendleri Artemisia canadensis 



Potentilla fruticosa (Dasiophora fruti- Solidago rubra 



cosa) . 



Station No. 5. — Meadow. Slope 20 degrees. Exposure 60 degrees west 

 of north. The surface soil is much richer than the soil below. 



Fades — Sporobolus brevifolius. 



Principal species: 



Aragallus lambertii Artemisia canadensis 



Pentstemon procerus ' Solidago rubra 



Potentilla fruticosa Erigeron macranthus 



Aragallus richardsonii Dasystephana parryi 



Campanula petiolata Juncus halticus 



Station No. 6. — Among willows about one meter from the creek side. The 

 soil here contains a large per cent of himius and is very moist throughout. The 

 area is flat. 



Fades — Salix chlorophylla and other willows. 



Principal species: 

 Phleum alpinum Agrostis hiemalis 



Mertensia ciliata Senecio triangularis 



Elephantella groenlandica Dodecatheon radicatum 



Potentilla pulcherrima Betula glandulosa 



Station No. 7. — Dry grassland. Slope 5 degrees. Exposure 10 degrees east 

 of north. The surface differs but little from the subsoil in moisture and quality, 

 both being dry and gravelly. 



Fades — Koeleria cristata. 



