SALICACEAE 



dif.fici.ilt group to name. They hybridize freely and in the future 

 outstanding willows for certain purposes may bo developed. 



DETUL&CEAE 



*AInus tenuif olia , Mountain Alder, is the shrub alder along 

 streams throughout the""ilaoky Mountains to northern Arizona and New 

 Mexico* It also occurs in the Cascades of '.'Washington and Oregon 

 and the Sierra Nevada s of California. Since it requires wet 

 situations in the mountains its use for ♦erosion control is limited 

 though it is an excellent soil binder along mountain streams. 

 This shrub or small tree is one of the potent reasons for the loss 

 of religion on the part of western fishermen, 



*Alnus oblongif olia, Mexican Alder, replaces the A, tenuif olia 

 in southern New Mexico and southern Arizona. This species makes a 

 real tree in spite of the statement regarding it in Sargent's Manual 

 of the Trees of North America. It is not infrequently fifty feet 

 high or more and sometimes one and one-half feet in diameter. Trees 

 of this size are to be found by the highway from Globe to Young, 

 Arizona- in canyons in the Gallino Mountains along Oak Creek south 

 of Flagstaff; and canyons in the south slopes of the Santa Catalina 

 Mountains. Large trees doubtless occur in other places as well. 

 This tree is an excellent soil binder along mountain streams and 

 the size of the tall straight trees suggests the use of the wood 

 for furniture. 



Be tula fontinalis or Mountain Birch, extends from northern 

 New Mexico and Ari zona northward into Canada. In habit it is 

 similar to the small alder. It is an excellent stream bank bin- 

 der but can only be used at relatively high altitudes along fresh 

 water streams. It is extremely ha 5 d on the fisherman's religion. 



Be tula gl a nd ul i f era is a lev." erect slender- stemmed birch 

 with small leaves, found only in swamps at high altitudes from 

 Colorado northward. It is a good soil binder but its water and 

 altitude requirements preclude its use as an erosion control 

 agent at present in man-devised plans. 



Ostrya knowl toni , the Hop Mornbean, is a small tree and a 

 very rare one, confined to the Grand. Canyon and Oak Croek Canyon 

 in Arizona, and to the Grand diver in Utah as far as records 

 establish its distribution. The leaves resemble those of a birch 

 but the fruit resembles that of a hop. This tree should make an 

 interesting novelty in arboreta, otherwise it is probably valueless. 

 Ostrya bailcyi, Bc.ilev's Mop Mornbean, is a quite similar tree, 

 con. -.nod to tne canyons or"' the Guadalupe Mountains in southern 



