IQI2] 



WATSON— PLANT GEOGRAPHY OF NEW MEXICO 



211 



DOUGLAS SPRUCE FORMATION 



Covering north-facing slopes above 8000 ft. and extending down 

 the narrower canons to about 7000 ft., we have a formation of 

 which the Douglas spruce (Pseudotsuga taxifolia) is the dominant 

 tree (fig. 6). This is the most mesophytic and dense of all our 

 forests. Here occur the blue and Canada violets, Berberis aqui- 

 folium (repens), Galium sp., Monarda fistulosa, Mertensia oblongi- 





■ 







Fig. 6. — In the canon the Douglas spruce association; on the rocky slope the 

 Pinus pondcrosa association; in the foreground, white oaks, verbena (in bloom), and 

 mountain mahogany; a small red cedar to the right of the rocks in the center. 



folia, Polemonium foliosissi 



Pachystima myrsin ites, Oxalis 



violacea, Prunus demissa, Fragaria, Rosa arkansana, Amelanchier 

 ijolia, Hcuchera paroifolia, Sedum Wrightii, Corydalis aurea. 



I pin a) occidentalism Aquilegia canadensis, Stellaria 



Clematis 



Janiesii, and Smilacina stellata. 

 Merriam, but nowhere in 

 belt around the mountains 



the 



?? 



of 



only 



most mesophytic places, as in the narrower V- 

 1 north-facing slooes where snow accumulates 



