ROSACEA. 285 



5. Prunus (Laurocerasus) ilicifolia. 



Cerasus ilicifolia, Nutt. in Torr. & Gray, Fl. 1, p. 411, & Sylv. 2, p. 16, t. 17 ; 

 Hook. & Am. Bot. Beechey, p. 340, t. 83. 



Hab. Near San Francisco, and in other parts of Upper California. — 

 The mature fruit of this cherry is purple when ripe, orbicular, com- 

 pressed, and more than three-fourths of an inch in diameter, with a 

 thin, rather acid pulp, and a fragile shell. — Holly-leaved Cherry. 



2. NUTTALLIA, Torr. & Gray. 



1. Nuttallia cerasiformis, Torr & Gray. 



NuUallia cerasiformis, Torr. & Gray, in Hook. & Arn. Bot. Beechey, p. 336, t. 82 ; 

 & Fl. 1, p. 413. 



Hab. Forests of Oregon, and in California as far south as Santa 

 Barbara. — A shrub, or small tree, seldom more than 15 feet high, with 

 few, slender, mostly upright branches. A remarkable character in 

 the seeds of this plant is that the cotyledons are convolute, not so 

 strongly as in Calycanthus, but very distinctly so ; a character which 

 has been detected in no other Rosacea except Chammmeles. 



3. SPIRAEA, Linn. 



1. Spiraea opulifolia, Linn. 



Hab. Banks of rivers, from Washington Territory to California; 

 chiefly the varieties mollis and capitata. — The Pacific forms generally 

 differ from the eastern in having more acute and incised leaves, with 

 lower surface, pedicels, and calyx more or less pubescent. In the 

 seeds of this species there is a thin but evident albumen. [Upon this 



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