> First of all, var.arenicola and var.occidentalis are said to be
> allopatric, thus should be considered subspecies according to your
> classification.
"said to" is the important point. There may be some geographic
gradation, however. Further study is clearly indicated.
> Second, I believe D.yutajensis is closest to D.montana var.
> montana and maybe conspecific. Though there are a few differences
> which suggest the former may truly be a good species.(...)
And I do *not* believe so.
Kind regards
Jan