I noticed in your (Jan's) new key for Drosera that the recent
D.yutajensis was not included and when I went to your CP list on the
net, I saw that you put D.yutajensis as a synonym of D.arenicola var.
occidentalis.
First of all, var.arenicola and var.occidentalis are said to be
allopatric, thus should be considered subspecies according to your
classification.
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.
The seeds are said to be subglobose in D.arenicola, but in
D.yutajensis and D.montana are ellipsoid, though most often slightly
fusiform in the latter. Seed size is more or less the same in all
three, varying from 3-4mm in length in D.a, 4-4.3mm in D.y, and 3-5mm in
D.m.
The sepals of D.y are c.3-5mm long, 2.5-3mm in D.a., and 2.5-4mm
in D.m. (though 3-4mm in D.m.var.tomentosa and 4.5-6mm in D.m.var.
schwackei), showing that at least between D.m.var.montana and D.y.
there is some difference, in the latter being slightly larger.
Stipules are 2-3.5mm in D.m., 5-6mm in D.y., and 3mm long in
D.a..
Here we see that those of D.y, are larger than in both other species.
Yet D.y.and D.m. have in common leaf shape and size: linear
-spathulated, c.1-2cm long. Maybe the leaves of the former are slightly
more spathulate. In D.a. the leaves are linear-oblanceolated, only up
to 1.3mm long, narrower, and the petiole is shorter than the lamina
(while in D.y. and D.m. the lamina is longer than the petiole). I
don't known about the pubescence of D.a. leaves, but in D.m.var.m. and
D.y it is the same, as is that found in the inflorescences.
Best Wishes,
Fernando Rivadavia
Tokyo, Japan