Gentiana newberryi var. tiogana

Very interesting, John!  We have no white-flowered gentians here; ours tend to be purple to blues (pale to greenish). 
The zoomable map is a nice feature in the Jepson key.

What magnificent blooms, John ... and beautifully photographed.  Another gentian to add to my wants list.  LOL.

Lori
Most of our Gentians are also in shades of blue and purple.

Cliff
This looks like an easy one. It creeps a little and blooms in late summer. The population in the photos grows on damp sloping meadows that dry through the summer. Not drying completely but by no means wet either. I took a couple of cuttings and they transplanted well.

Nice form and colour!
I checked Alplains as usual with western plants, he lists a blue form:
http://www.alplains.com/
Gentiana newberryi (Gentianaceae) (8x8,Z4,P,L,3:8w) .................................................... 100 seeds / $4.00 58352.22 (W) Trinity Co., CA, 7900ft, 2408m. On short stalks over small rosettes are borne dark blue, fringed flowers with darker stripes in the throat and speckles on the petals. On volcanic ultramfic soils near timberline
photo:
http://www.alplains.com/images/GentNewberryi.jpg

[Moderator edit to fix link.]

I love the white form with green speckles and dark bands of color on the outside, but the Alplains blue form is exquisite!

I have to agree blue gentians are amazing. I hope I come across a blue newberryi in bloom sometime.

I do like the white form though! Here only some rare, small, northern species have whitish flowers. Had been exiting to come across a white form of the commoner ones once!

I do like both forms, though agree with what I think Trond is saying- to me the white seems more exotic- and I do love white flowers with a hint of  other shades...
I sowed seed of a number of Gentians early last spring, nothing happened this summer, hoping for some action next spring...