Cottonwoods
Populus balsamifera, angustifolia, & deltoides
Lewis found three species of cottonwood trees in Montana. They are
sometimes difficult to distinguish from one another, due to their
ability
to hybridize. Cottonwoods were used to make 12
of the 17 dugout canoes used by the expedition.
http://www.lewis-clark.org/article/1334
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