280 SELECT PLANTS FOR INDUSTRIAL CULTURE 



Quercus Mongolica, Fischer.* 



Manchuria. It is on this tree and 011 Q. serrata that the silk-insect 

 peculiar to Oak-trees mainly, if not solely, is reared, as shown by 

 Dr. Hance. 



Quercus Muehlenbergii, Engelmann. 



Middle and Eastern States of North America. A middle-sized tree ; 

 its wood compact, strong, durable for posts, railway ties (Sargent). 



Quercus obtusiloba, Michaux. 



North America. This tree will live on sandy or otherwise sterile 

 soil.. Wood very durable (A. Gray). 



Quercus palustris, Du Roi. 



The Pin Oak or Marsh Oak of North America. Height 80 feet ; 

 of quick growth. The wood though fine-grained, is strong and 

 tough, It is ornamental for furniture on account of the strong 

 development of medullary rays. 



Quercus Phellos, Linne". 



The Willow Oak of the Eastern States of North America. The 

 acorns available for food, like those of several other species for 

 instance, Q. glabra (Thumb.) of Japan. A variety of closely allied 

 species is the shingle-oak, Q. imbricaria, Mich. The comparative 

 value of the very numerous Cis- and Trans-Atlantic Oaks, but 

 little as yet understood either for avenue purposes or timber 

 plantations, should be tested with care in botanic gardens. The 

 timber is valuable. Even recently Oaks have been discovered on 

 the mountains of New Guinea. 



Quercus Prinus, Linne. 



The North American Swamp Oak or Chestnut Oak. A tree 90 

 feet high, stem up to 15 feet in girth, available for wet localities. 

 Foliage deciduous. Wood strong and elastic, of fine grain ; 

 according to Porcher it is easy to split and not hard, used for 

 building purposes, also cooperage. A red dye is also produced 

 from the bark. The bark is one of the most important among oak 

 barks for tanning, furnishing a very solid and durable leather. Q. 

 bicolor (Willd.) is closely allied to Q. Prinus; trunks have been 

 measured 30 feet in circumference. 



Quercus Robur, 



The British Oak. Extending through a great part of Europe and 

 Western Asia, attaining a great age and an enormous size. Extreme 

 height 120 feet. It has been known to attain a stem 12 feet in 

 diameter at ths base, 10 feet in the middle, 5 feet at the main 

 branches. Two varieties are distinguished : 1, Q. sessiliflora 



