Hybrid Oaks : General mode of Cultivation. 215 



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



hybrids : 



Qaercus sinuata, probably from Q. Catesbaei and Q. laurifolia. (South 



Carolina.) 



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

 " Leana, from Q. imbricaria and Q. coccinea. (Ohio to Mis- 

 souri, and near Washington.) 



" heterophyUa, from Q. phellos and Q. coccinea. (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 till 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 off with a sharp knife, to 

 induce the formation of lateral roots and more abundant radicles. 



120. Querciis pedunculata : The English Oak Leaves, Flowers, and Fruit. 



