Equisetum variegatum var. Jesupi A. A. Eaton, Fern Bull. 12: 24. 1904.
This variety has some of the characters of H. variegata, towards
which it trends. The teeth have long, generally persistent awns
and the anatomy is variable, sometimes of one type, sometimes
of the other. The size and aspect are intermediate but the tight,
cylindrical sheaths place it with H. hyemalis rather than with
Belle Isle, Mich., Farwell 211a, June 4, 1895; Rochester, Mich.,
Farwell 211b July 4, 1896. Mr. C. K. Dodge has collected it
at Port Huron, Mich. Its general distribution is from Illinois
to Connecticut, northward into Canada.