Cornucopia II has sources listed at the end of each entry.
Most of the cultivars of Cornus mas that you listed have D47 as a
source. (Some have other sources also.) Look up D47 in the Suppliers
list near the back of the book:
D47
A.I. Eppler Ltd.
P.O. Box 16513
Seattle WA 98116
(206) 932-2211
Cat $3, refundable
R & W (retail and wholesale)
PC (personal checks)
OVER (overseas)
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