ACADEMY OF NATURAL SCIENCES. 83 



eter, with rather smooth bark and dense, graceful foliage ; it may well vie with 

 its Eastern congeners. Banks of Walnut Creek east of the Oakland hills. 



Castanea chrysophylla Dougl. California Chinquapin. 



A low, straggling evergreen and gregarious shrub, occurring only on the out- 

 croppings of the white sandstone in the Oakland hills. 



Quercus densifiora Hook and Arn. 

 Tamal Pais and Eedwoods of Marin County. 



Quercus agrifolia Nees. Live Oak. 

 A shrub as well as a large tree ; everywhere in moderately moist situations. 

 Quercus tinctoria var. Californica Torr. Black Oak. 

 Hill sides, Marin County. 



Quercus lobata Ne"es. White Oak. 

 Hill sides Marin County and banks of Walnut Creek. 



Quercus acutidens 1 Torr. Scrub Oak. 

 Evergreen ; forming dense chaparral on Tamal Pais. 



Corylus rostrata Ait. Beaked Hazelnut. 



Very common on the eastern slopes of the Oakland Hills. A shrub four to 

 six feet high. 



Salix (four species.) Willow. 

 Wet grounds everywhere, six to twenty feet high. 



Popidus tremuloides Michx. Aspen. 

 A medium sized tree on the banks of Walnut Creek. 



Torre ya Californica Torr. California Nutmeg Tree. 

 A large tree with long spreading branches, and rather smooth bark. Wood 

 valuable ; rare, on banks of Papermill Creek, Marin County. 



Sequoia sem-per vir ens Endl. Redwood. 

 A very large tree, forming small groves on the northern slopes of hills in 

 Marin County, and on the eastern slopes of the Oakland hills. 



Pinus insignis Dougl. 

 A small tree ten to fifteen feet high, on the outcroppings of white sandstone 

 in the Oakland hills, third ridge eastward ; rare. 



Pinus contorta Dougl. 

 A medium sized tree, ovate in outline. Hills of Marin County ; rare. 



Abies Douglasii Lindl. Oregon Pine. 



A very large tree, yielding excellent timber. Grows with S. sempervirens 

 in small groves on the northern slopes of hills, Marin County. 



Cupressus Mac-Nabiai\a ? Murray. Cedar. 

 A spreading shrub, eight to twelve feet high, on Tamal Pais ; rare. 



