Comments: The sugar maple and the black maple are treated by Kartesz (1994, 1999) as different species (Acer saccarum and Acer nigrum, respectively); they are sometimes considered to be subspecies or varieties of the same species (in which case the name Acer saccharum has nomenclatural priority, with the black maple being called Acer saccharum ssp. nigrum or Acer saccharum var. nigrum). Note that the species Acer saccharinum (silver maple) has a similar name.
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