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RHOMBIC LEAVED ALDER. 
ALNUS rhombifolia; foliis subrhomboideo-ovatis obtusius - 
culls glutinosis basi acutis , sub duplicators errulat is serratu- 
ris crebris acutis , subtus puberulis axillis venarum nudis, 
stipulis oblongis membranaceis deciduis. 
I observed this species, a large shrub, in the vicinity 
of Monterey, in Upper California. Its nearest relation 
appears to be to the European Alder, (A. glutinosa,') 
from which, however, it is abundantly distinct. The 
fruit I have not seen. 
The leaves are about 2 inches long and li wide, 
glutinous, beneath nearly the same colour as above, 
and pubescent along the veins; the petioles are not more 
than about 2 lines long. The twigs are smooth and 
brownish. It appears to be allied to the oblong-leaved 
Alder (A. oblongata ) of the South of Europe. 
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