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Torr. & Gray ex Hook.
sec. fna.org 1993
common name: black cottonwood
Steven J. Baskauf
Santram River Rest Area, I-5, Marion County, Oregon, US
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whole tree (or vine) - general
bark - of a large tree
twig - orientation of petioles
leaf - whole upper surface
leaf - margin of upper + lower surface
leaf - showing orientation on twig
fna.org 1993 =
Flora of North America Editorial Committee, eds., 1993. Flora of North America North of Mexico. Flora of North America Association, New York, NY, US and Oxford, UK.
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