1SS 



PAUL C. STAND LEY 



Accompanying these trees are shrubs like the choke-cherry, 

 service-berry, gooseberry (Grossularia leptantha), and willow 

 (Salix bebbia?ia), and numerous hydrophilous herbs, such as 

 Aster laevis, A.frondeus, and A. wootonii, Apocynum scopulorum, 

 Epilobium novomexicanum, and Prunella vulgaris. 



Elsewhere, on the slopes having normal conditions of soil, 

 moisture, and exposure, there is usually a heavy shrubby under- 

 growth, composed chiefly of deciduous scrub-oaks. The thick- 

 ets are often very dense, but there are many open places among 



Fig. 3. Yellow pine with undergrowth of scrub-oak. Young pines may be 

 seen on the right. This is typical Transition vegetation. 



them and at higher altitudes they gradually disappear. Other 

 accompanying shrubs are Padus melanocarpa, Amelanchier , 

 Uva-ursi uva-ursi, Ceanoihus j'endleri, Symphoricarpos oreo- 

 philus, Odostomon repens, Berberis fendleri, and Sericotheca 

 dumosa. It was interesting to find Yucca angustifolia common 

 in the Transition Zone, a few individuals growing in the shade 

 even of firs. It had been believed hitherto that in New Mexico 

 only one species of Yucca, Y. baileyi? reached such a high 

 altitude. 



3 Contr. U. S. Nat, Herb. 16: 114. 1913. 



