This is a.......yellow flower of some kind. It seems like it should be easy to identify, but I tried a couple of flower ID sites and they didn't help. Any ideas? I took the picture in southern Colorado.

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Coreopsis, possibly lanceolata (lance-leaved).
That's what came to my mind. But I'm not familiar with what grows in Colorado.
Emboldenrod.
I concur with @Rugosa53 that it is a Coreopsis. l do not concur with @cld.
As I always say, take pictures of the rest of the plant, too, not just the flowers.
Look at that yellow. Very bold.
Lasthenia californica - California goldfields, a species of flowering plant in the Asteraceae family. Native to western North America.
I'd go with Robert's ID -- the deeply ridged oval petals with a few regular teeth at the end, and the proportions... but as far as I can tell, Colorado is out of range, except maybe the extreme southwest corner. Mysterious...
Now correct for climate change.
Kevin does say it's in southern Colorado, and my plant ID app shows it in Arizona and New Mexico, so maybe a couple seeds blew across the state line.
Agreed to all. I'm no expert, I get my info from an enthusiast site, and those are usually pretty up-to-date. But it's not showing NM in the mix for this one, just AZ. Car bumpers ... birds ... seeds do move amazingly quickly.
no idea, but zoom in and you can see the stem is kinda spiny if that helps narrow things down for someone who knows about such things
My iPhone is happy to identify flowers in photos. It says Golden Crownbeard. Looks right to me.