FLORA OF THE SAN ANTONIO MOUNTAINS 85 



SALICACE.E 



Salix cor data Muhl. var. Watsoni Bebb. Very common in springy ground in the 

 Upper Transition Zone where it is usually found growing between 6500 and 

 8000 ft. alt. (Nos. 1286, 1408, 1665, 1955, 1980.) 



Salix flavescens Nutt. Frequent in moist ground along creeks, above 7500 ft. alt. 

 Always in the higher parts of the Transition Zone. A station quite different 

 from any other seen, is in the Canadian Zone on Pine Mt. at an altitude of 

 8250 ft. On a small, dry, rocky bench, a stone's throw from the ridge crest, 

 there is a colony of this willow. (Nos. 1287, 1394, 1683, 2033.) 



Salix laevigata Bebb. Found just within the pine belt on both sides of the moun- 

 tains. 



Salix Parishiana Rowlee? Specimens collected in a small meadow below the 

 Native Son Mine were doubtfully referred to this species by Mr. C. Schneider. 

 (No. 1685.) 



Salix exigua Nutt. var. virens Rowlee. The willow mentioned here was found 

 growing on the gravelly floor of a very narrow side canon, alt. 7500 ft. in the 

 Upper Transition Zone, near the head of San Antonio Canon. The plants, 

 which form a very large colony, are all less than a. meter high, despite the fact 

 that all branches are erect. The colony is further noteworthy in that the 

 majority of the catkins examined showed the presence of both staminate and 

 pistillate flowers. 



Regarding the determination of this willow Mr. Schneider writes, "A very 

 interesting form which might be *S. exigua virens Rowlee sensu stricto, but it 

 also much resembles S. melanopsis Bolanderiana." (Nos. 1401, 1665, 2095.) 



Populus trichocarpa T. & G. Frequent in the lower canons, but in the pine belt 

 it is not common and apparently confined to the Upper Transition Zone. 

 All the pine belt specimens seem to tend towards narrow leaves. The form 

 ingrata Jeps., may be considered present, for occasional trees or parts of 

 trees have distinctly lanceolate leaves. (No. 1447.) 



Populus Fremontii Wats. Lower Transition Zone at 6500 ft. in North Fork Lytle 

 Creek and at 5000 ft. alt. in Prairie Fork. A common valley species. (No. 

 1659.) 



BETTJLACE.E 



Alnus rhombijolia Nutt. Common along streams in the Upper Sonoran and Lower 

 Transition Zones. Ascending as high as 7000 ft. alt. 



FAGACE^2 



Quercus Kelloggii Newb. Common around 6500 ft. alt. in Prairie Fork. Very 

 abundant near the head of South Fork Lytle Creek and on San Sevaine Flat. 

 (Nos. 1450, 1714 ) 



Quercus Wislizeni DC Very common in the Upper Chaparral Belt and extending 

 a short distance up into the Lower Transition Zone. 



Quercus chrysolepis Liebm. Common in the lower canons above 3000 ft. It as- 

 cends the mountains to a maximum altitude of 8500 ft. on the steep south 



