Equisetium

[Eco Chad]

I am interested in plants of the ancient fern ally genus Equisetium
(commonly called Horsetails).  I have found it difficult to get any
information on the distributions of the species of this group.  I would
greatly appreciate any information that anyone can provide on this
fascinating group.

Thanks,

Chad Husby

P.S.  I am especially interested in Equisetium diffusum and I would like
to know what its native range is and how I might obtain and culture it.