Curious Mulberry Problem

Looking at Fig.10 in the link https://www.extension.purdue.edu/extmedia/fnr/fnr_237.pdf, provided from Matt_in_Maryland here: Mulberry: the king of tree fruits (for pigs) - #100 by Matt_in_Maryland
Is it possible these trees to be red or slippery elm (Ulmus rubra) and not mulberry?

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