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In Minnesota and Wisconsin, people do often call the red osier dogwood as "red willow". In the case of Warren, I am pretty certain his use of the word "red willow" is for the red osier dogwood, but I don't know about other sources that references "red willow" if they really meant red willow or if they really meant red osier dogwood. Will need to look into this a bit more. CJLippert (talk) 13:29, 28 July 2014 (UTC)Reply
It appears the sources that say "red willow" is referring to either Red Osier Dogwood (Cornus sericea) or Silky Cornel (Cornus amomum), depending on the location, but definitely not Red Willow (Salix laevigata). However, in areas where both Cornus species are found, it is not clear which is preferred. Even the Ojibwe language does not help as the word for both of these Cornus species are called miskwaabiimag : red-barked. CJLippert (talk) 13:43, 28 July 2014 (UTC)Reply