IN EXTEA-TROPICAL COUNTRIES. 271 



merce are obtained. A variety, Q. Lusitanica (Webb), or Q. 

 Mirbeckii (Durieu), attains a height of 120 feet, with a stem 

 girth of 20 feet. Some states of this are almost evergreen. 



Quercus lancifolia, Roxburgh. 



A tall timber tree of the Himalayas. Wood valued for its 

 durability. 



Quercus lobata, Nee. 



California. The Sacramento White Oak. Up to 150 feet 

 high and 6 feet in diameter, with wide-spreading branches. 

 The wood is brittle when green, but hard and tough when 

 seasoned; its value has been much underrated (Gibbons). 

 The acorns of this Oak used to form a large proportion of the 

 winter food of the aboriginal inhabitants of North California. 



Quercus lyrata, W r alter. 



The Overcup Oak of the South-Eastern States of North 

 America, extending from South Illinois to Florida and 

 Louisiana. A tree of majestic size, 80 feet high, with a 

 stern 4 feet in diameter. Lately recommended as one of 

 the most valuable for timber cultivation, especially for wet 

 ground. 



Quercus macrocarpa, Michaux.* 



The Bur Oak of North America. Tree 70 feet high. The 

 timber nearly as good as that of the White Oak. The bark 

 contains about 8 per cent, tannin. 



Quercus macrolepis, Kotschy.* 



Greece. This Oak yields also Valonia, being closely allied to 

 Q. segilops. 



Quercus Mongolica, Fischer.* 



Manchuria. It is on this tree and on Q. serrata (Thunberg) 

 that the silk-insect peculiar to Oak trees mainly, if not solely, 

 is reared, as shown by Dr. Hance. 



Quercus palustris, Du Roi. 



The Pin Oak or Marsh Oak of North America. Height 

 80 feet ; of quick growth. The wood, though not fine-grained, 

 is strong and tough. 



Quercus Phellos, Linne. 



The Willow Oak of the Eastern States of North America, 



