Hybrid Oaks : General mode of Cultivation. 215 



heretofore described as species, are regarded by Dr. Engelmann as 

 hybrids : 



Quercm sinuccta, probably from Q. Cate^aei and Q. laurifolia. (South 

 Carolina.) 

 " tridentata, from Q. imbricaria and Q. nigra. (Illinois.) 

 " Leana, from Q. imiricaria and Q. cocdnea. (Ohio to Mis- 

 souri, and near Washington.) 

 " heteropliyUa, from Q. pliellos and Q. eoccmea. (In New Jer- 

 sey and Delaware.) 

 855. Oaks succeed best on a deep loomy soil, and on low lands 

 rather than upon hills. They are especially liable to injury from 

 late spring frosts, both in the blossoms and leaves, and having a 

 long tap-root, they are somewhat difficult to transplant, without 

 careful preparation, tending to the suppression of this root, and to 

 the formation of abundant fibers. They may be planted in the fall 

 or early in the spring, in the places where they are to remain, and 

 should be cultivated tUl they shade the grounds. When started in 

 nurseries, they should be transplanted two or three times before final 

 planting, and the tap-roots should be cut ofi" with a sharp knife, to 

 induce the formation of lateral roots and more abundant radicles. 



120. Qaereui pedunmlaia: The English Oak— Leaves, Flowers, and Fruit. 



