Probably another one that actually belongs to a more southern type, like P. reflexa (as does the commonly planted 'Vanderwolf's Pyramid').
RE: Probably another one that actually belongs to a more southern type, like P. reflexa (as does the commonly planted 'Vanderwolf's Pyramid'). Maybe not Reflexa. I think 'Red Hill' is a place in Colorado. So I'm guessing the broom was found there. And, to my knowledge Reflexa isn't native there - it's further south, and erroneously called "Strobiformis". (I'm stealing this analysis from Michael). I posted a picture of a plant I bought as strobiformis but that is probably reflexa earlier today. I could compare the needles under a hand lens I guess. And I guess "Red Hill" doesn't necessarily refer to the Colorado location. So who knows. Was there something about the photo that made you think it was reflexa? You must have a good eye. Or do you know something about the cultivar?
This looks like it could easily be true P. flexilis; to check, look to see if the needle margins are completely smooth (unless you have a good microscope, I reckon the best test for this is to run a needle tip-to-base along one's lips: lip skin has the sensitivity to be good at detecting the minute serrations that distinguish P. reflexa).
Comparatively few ('Vanderwolf's Pyramid' is all over the place) limber pine in cultivation here all darker in overall foliage color, without the dominating bluish- or silveriness of such P. reflexa cultivars - but this of course may not be a universal characteristic. Years ago I saw limber pines in Yellowstone and elsewhere but wasn't thinking about how they might differ from closely similar species at the time.