Botanical Garden. The mountain form is hardier but grows 
more slowly than does the form native to the West Coast [9D]. 
P. taxifolia. B. C. to Calif, and Mex. 
P. t. glauca. 
PTELEA, Rutaceae. Large, rather coarse shrubs, with trifoliate 
leaves and interesting circular, flattened fruits [3J, 5C]. 
P. serrata. Ga. 
P. trifoliata. Hop-tree; Ont. to Fla. and Minn. 
P. t. mollis. Tex. to N. C. and Ill. 
PTEROCARYA, Juglandaceae. Wing-nut. Trees with large 
pinnate leaves. Tender, at least when young [nursery]. 
P. stenoptera. China. 
PTEROCELTIS, Ulmaceae. A tree that is killed back in winter 
when young. Because of this it has not exceeded the dimen¬ 
sions of a shrub at the Garden [nursery]. 
P. Tatarinowii. N. and C. China. 
PTEROSTYRAX, Styracaceae. P. hispida, the hardier of the 
two, has large, light green leaves, whitish on the undersides. 
The large pendulous clusters of small white flowers are attrac¬ 
tive. P. corymbosa suffers in winter and has not bloomed at the 
Garden [nursery]. 
P. corymbosa (Halesia c.). Japan. 
P. hispida. Epaulet-tree. Japan (Jn.). 
PYRACANTHA, Rosaceae. Firethorn. Semi-evergreen shrubs 
with brilliant red or orange fruits. Adaptable as wall shrubs. 
P. coccinea Lalandii is the hardiest and most commonly grown 
in this region [5E, nursery]. 
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