36 



Oklahoma about the heads of the streams which find their way into 

 the State and it is very probable that some of these trees may be 

 found in the far northwestern part of the State along- the streams. 



THE OAK FAMILY. CUPULIFERAE. 



THE BIRCHES. Genus BETULA. 



Betula, derived from bitumen. Birch is from Betu the Celtic name, or from 

 batuere, to beat. 



RIVER BIRCH. WATER BIRCH. RED BIRCH. 



Betula nigra. 



Common along many of the streams in eastern half, chiefly small 

 growth ; some large, fifty feet high, two feet in diameter. 



EUROPEAN WHITE BIRCH. 



Betula alba. 



In cultivation under several names which indicate the character 

 of growth or foliage, as "Weeping- Birch." 



THE ALDERS. Genus ALNUS. 

 SEA SIDE ALDER. 



Alnus maratima. 

 Along Red River and tributaries southeastern corner of State. 

 SMOOTH ALDER. 



Alnus rugosa or A. serrulata. 



Along streams and hillsides in eastern and southeastern pan of 

 State. It was found growing high up in the hills north of Quinton. 



THE HAZELNUTS. Genus CORYLUS. 

 WILD HAZELNUT or COMMON HAZELNUT. 



Corylus Americana. 

 Found in a limited area near the center of east side. 



THE HORNBEAMS. Genus CARPINUS. 

 AMERICAN HORNBEAM. BLUE or WATER BEECH. 



Carpinus Caroliniana. 



Found in eastern part of State but not so common as the Iron- 

 wood. 



