Well it turns out there *ARE* CPs in the Yellowstone area! :)
In the southern section of the park, a bit north from the border with Grand Teton National Park, this past weekend I found what I believe were D.anglica just coming out of dormancy, growing at a roadside seepage trampled by bison at ~2350m altitude.
I didn't see any Utrics at this site, although it looked very similar to sites I'd seen in California which were covered in Utrics. I thought it was probably just a little too early in the season to see Utrics. There was still even some snow mounds along this road in the shadier sections (although outside temperature was in the mid to high 20's C).
But later that day, looking at the pics in my hotel room, I noticed there apparently were Utrics at that site after all, let's see who can spot them in the pics below. :)
First, the habitat:
Although the seepage was large, I only saw D.anglica in two small spots. I'm not sure what made those spots so special, they didn't seem wetter or different in any way to my inexperienced eyes in regards to temperate-CP habitats.
The leaves had relatively short lamina, looking almost like D.intermedia. I'm not sure if this was because they were just coming out of dormancy, since I don't know what this species looks like at this stage. But I also found some old scapes and these were very short, only a few cm long. Could this have been the small D.anglica form that some people refer to as D.anglica var.pusilla or D.kihlmanii?
And here are the pics:
Notice all the mosquitoes trapped on the leaves! There sure were a lot of them at this site.... Damned bloodsuckers!
There were a lot of other wet habitats inside Yellowstone, but most were run-offs from steam vents and geysers, which I assume are not good for most CPs. However D.linearis is know from a few sites further north in Montana - maybe they'd be comfortable in these assumedly alkaline seepages?
Either, way, I confess I didn't spend much time searching for CPs, when there was so much to see in Yellowstone... :)