ACADEMY OF NATURAL SCIENCES. 79 



gregarious, forming dense chaparral, on the northern and eastern slopes of hills 

 and mountains; evergreen. Much cultivated on account of the profusion of 

 its fragrant flowers, and the various shapes that may be given it by trimming. 

 Ceanothus rigidus Nutt. 

 Low, straggling, four to six feet high, less gregarious than the former ; on the 

 white sand-stone hills, east of Oakland. 



Ceanothus . 



A small shrub, three to four feet high, with very small glandular leaves ; mostly 

 single or in groups, on Mount Tamal Pais at 2,700 feet elevation. 



Lupinus albifrons Benth. Silver-Leaved Lupine. 

 Very common in almost pure sandy soil, oblong in outline, two to six feet 

 high ; growing mostly single, evergreen. 



Lupinus macrocarpus Hook, and Arn. Yellow Lupine. 

 Large, spreading, oval in outline, evergreen, with large fragrant flowers ; gre- 

 garious in moist gravelly places along the shore of the bay, and in depressions, 

 or banks of runs, where the soil partakes of a clayey nature. 



Pickeringia montana Nutt. 

 Large, spreading, four to seven feet high ; evergreen, and gregarious on the 

 Oakland white sand-stone hills. 



Cerasus Ilicifolia Nutt. California Cherry, or Plum. 

 A small tree, eight to fifteen feet high, with thick, shining, spinously serrate, 

 evergreen leaves ; fruit of a yellowish pink color, with a thin pulpy external 

 portion. Hill sides on the peninsula of San Francisco, growing mostly in 

 groups ; rare. 



Cerasus serotina Ehrh. Black Wild-Cherry. 

 A group of three or four small trees, eight to twelve feet high, near a road 

 in the Oakland hills. Undoubtedly introduced from the Atlantic States. 



Cerasus emarginata ? Dougl. 

 A small shrub, three to four feet high, with very slender reddish and white 

 dotted branchlets, and deciduous leaves ; rare. Tamal Pais, 2,700 feet elevation. 



Nuttalliq Cerasiformis Torr. and Gray. 

 Oblong in outline, four to six feet high, deciduous ; common on the northern 

 slopes of hills, in clayey soil. Along the bay and Oakland hills. 

 Spiraea Opulifolia Linn. Nine-Bark. 

 Large, spreading, eight to fifteen feet high ; common on the banks of creeks 

 among the Oakland hills. 



Spiraea Aricefolia Smith. 

 Common on banks of creeks and northern slopes of hills, Oakland. 



Cercocarpus parvifolius Nutt. 

 Rare, on the hills in Marin County. Its spirally-tailed seeds give the shrub an 

 appearance as if in full blossom, 



Adenostema fasciculata Hook, and Arn. 

 Oblong in outline, four to five feet high ; very gregarious, forming extensive 



