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I only received two substantive replies to my post, including from Linda Goldkrantz who today has posted information about veria.com broadcaster Sunny Savage's cattail recipes, plus confirmation from a horticulturalist about what I had learned with more research since posting:

Wheat, barley, rye and oats are all in the botanical family Poaceae, and from only two genus and several species in that family, whereas cattails is a completely different family, Typhaceae.  They are more distantly related to WBRO than are, for example, corn and rice. 

I've noticed here as well as other places that "gluten" gets used generically, as in occasional references to "corn gluten", and our nemesis "gliadin", is not reported outside the family Poeceae, from what I have learned.

I look forward to a meal after I find some cattails in an unpolluted marsh!

Jack



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