David:

There is no such thing as Pinus thunbergi 'Mikawa'.

Mikawa is a district in Japan on the Atsumi and Chita Peninsula in
Aichi Prefecture. Any Japanese black pine, Pinus thunbergi which comes
from that area can be called "Mikawa".

So, Mikawa is a provenence source for Japanese black pine. It should
not be labeled as a cultivar or used with single quotation marks.

Hope this helps clarify the correct use of the word Mikawa.

By the way, Heritage Seedlings in Oregon was selling seedlings of
Mikawa Japanese black pine a few years ago. As you well know, cultivars
can not be propagated by seed, only vegetatively (grafts, cuttings,
layers, division or microculture).

Bill

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