Vi 
PoruLus 
Porutus 
Porvutus 
PoruLus 
PoPULUS 
Popru.us 
HETEROPHYLLA 
BALSAMIFERA 
ANGUSTIFOLIA . 
TRICHOCARPA 
DELTOIDEA 
FREMONTUO 
CONTENTS. 
Plate cecclxxxix. . 
Plates cccexe., ceccxci. 
Plate cecexcil. 
Plate cecexciii. 
Plates cccexciv., ccecxcv. : 
Plate ccceexcvi. . 7 
163 
. 167 
171 
175 
179 
. 183 
