Need help, do you know what this is?

Has not flowered as of yet, growing in Denver, Co.

 

Epilobium, possibly E. parviflorum (if that occurs there).

 

You must be thinking of something else, Ron.

 

Checked photo's of what you thought it was Ron, they don't seem close to what we have here, thanks for posting though.

 

Epilobium was my first thought, when I noticed pink spots among the leaves. Looking at them in a large zoom, I bet those pink spots come from behing this patch. The overall view of the plants reminds me Lepidium or similar stuff from Brassicaceae.

 

I took the pink to be the flowers of the same plant. Small fireweed species are polymorphic, there are Google photos of the species I mentioned showing similar foliage. After it blooms it will be more recognizable, whatever it is. It looks familiar, maybe something in the mustard family.