Black cottonwood tree

Butterfly host to:
Mourning cloak butterfly
Western tiger swallowtail butterfly

Reference books
Intermountain Flora Series
Plants of Southern Interior British Columbia and the Inland Northwest
National Audubon Society Field Guide to Trees: Western Region
A Field Guide to Western Trees

Picture of black cottonwood tree or Populus trichocarpa
Black cottonwood tree - Populus trichocarpa

Picture of cottonwood cotton downy fluff
Black cottonwood
cotton-like fluff and caterpillar-chewed leaves

Black cottonwood with cotton-like fluff
Black cottonwood
cotton-like fluff

Picture of black cottonwood bark and leaves
Black cottonwood bark
old and young trunks

Picture of black cottonwood in autumn with yellow leaves
Black cottonwood in fall
with yellow leaves