I stumbled across this Carex the other day (fortunately, I wasn't injured, but as long as I was on the ground already, I snapped this photo). I discovered that there are at least 115 species of Carex in Montana, so I asked a botanist friend which one this was. "Hmmm", he opined, "it's difficult to identify in this state."
"So what do we do?" I asked in my best Groucho voice. "Drive it over to North Dakota?" Ba-Dum.