CUPULIFER^. (oak FAMILY.) 107 



* Deciduous trees; acorns maturing the first season. 

 t Barh whitish gray. — White Oaks. 

 Quercus lobata, Nee. Branches slender, often drooping; acorns tapering, in a deep 

 rough cup. The most common valley oak. 



Q. Garry ana, Dougl. Branches coarser; bark thinner; acorns obtuse, in a shallow 

 cup; winter buds large. 



Q. Douglasii, Hook. & Am. (Mountain White Oak or Blue Oak.) Leaves smaller, 

 less deeply lobed or entire, bluish green; acorn tapering, about an inch long. 



t + Bark dark colored, rough; large leaves sharply 

 Q. Kelloggii, Newberry. (Kellogg's Black Oak.) Acorns large, obtuse, very hairy 

 inside. Common in the Coast Ranges and foot-hills of the Sierra Nevada. 



* * Evergreen trees; acorns maturing the second season. — Live Oaks. 



Q. chrysolepis, Liebm, Bark ash-gray; acorns obtuse; cup tawny or yellow. 



Q. Wislizenii, A. DC. Bark black; acorns slender, tapering. 



Q. densiflora. Hook. & Am. (Chestnut Oak. ) Differing from all other oaks in hav- 

 ing erect aments. Acorns large, obtuse, in thick cups, which are covered with slender, 

 rigid, recurved scales. 



* * * Evergreen trees; acorns maturing the first season. 

 Q. agrifolia. Nee. Chiefly distinguished from Q. Wislizenii by its annual acoms. 

 Order Thymeleaceae is represented by Dirca occidentalis or Leatherwood, a branching 

 shrub, 3 or 4 feet high, with flowers in axillary clusters of 3 or 4. 



