In search of seed from _Cercidiphyllum_

[Michael S Dosmann]

Greetings:

I am in the introductary stage of a research project involving variants 
of katsura tree, _Cercidiphyllum japonicum_ and _C. magnificum._  It will 
be a pseudo-taxonomic/genecological study.
What I am looking for are seed sources of known provenance, if possible.  
I have contacted some botanical gardens and arboreta (and will be 
contacting more) but thought that I would check with readers of this 
group to see if they had knowledge of additional sources (campus 
collections, seed banks, etc...). 
If you know of any sources (or have insight into this outstanding tree) 
please e-mail me at the address below.

Thanks,
Michael

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Michael S Dosmann
dosmann at iastate.edu
Graduate Research Assistant
Department of Horticulture
Iowa State University