Wanted: Neotropical Equisetum

[MB Cal]

I am a botany undergraduate student and I am very interested in growing
and studying the tropical members of the ancient genus Equisetum.  I would
especially like to obtain and grow the Neotropical species E. bogotense,
E. myriochaetum and E. giganteum.  I would greatly appreciate any help
that anyone can give me in obtaining these plants.

Thanks for your help.
Chad Husby