plants for zone 4 dry shade?

I just joined this list a few days ago.  Hello to Marge, Gene, Rosemary, and
any others who might remember me from the Gardens list a couple of years
ago.

I have a spot I want to develop into a new bed.  Its under Douglas fir and
Larch.  The spot gets lots of medium to bright shade as the tree branches
begin about 15' up.  The soil is *very* dry volcanic silt with little, if
any, organic matter.  I will ammend some but I can't dig too deeply because
of the tree roots.  I'm willing to start with annuals but eventually want to
include hardy perennials. Perennials must be able to with stand temps. down
to -30 without snow cover since the trees prevent much snow from
accumulating.

I would appreciate any suggestions or ideas.

Thanks,
Terry King
USDA zone 4b, E. WA.
taeking@endlesshealth.com
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