Right now there's a particularly perplexing yellow flower that when keyed out seems either to be Rattlesnake Weed (Hieracium venosum) or Two-Flowered Cynthia (Krigia biflora):
[image credit Gary, sorry it's a bit fuzzy]
The flower is a better fit with being Rattlesnake Weed, but the leaves don't quite synch up; the leaves match up better with Two-Flowered Cynthia but the flowers are off.
Both plants are likely to inhabit Reese Hollow. So, I must be content with just admiring the beauty of these flowers; after all, as one of my Bio profs once said, in a remark that obviously stuck, "The name is the least important piece of information about a plant."
Oh, and the link to Ultrarunning is that spotting flowers is one of my favorite incidental activities while running. I often stop dead in my tracks to admire some posie that happens to be within eyeshot of the trail. And while I may wonder about its name, I (usually) don't get obsessed about it and instead just enjoy the sight.