|Green Gentian (Frasera speciosa)|
I point this out because I am worried that people are confusing this cool plant with the Colorado list C noxious weed, Mullein (Verbascum thapsus). I don't want people to pull the wrong thing by mistake; several people who have come into my office have almost done so.
Here's how you tell them apart:
Mullein has fuzzy leaves, Green Gentian's leaves are smooth.
Mullein has yellow flowers, Green Gentian's flowers are a greenish white.
Pictures of Green Gentian: http://www.swcoloradowildflowers.com/brown%20green%20enlarged%20photo%20pages/frasera%20speciosa.htm
Pictures of Mullein: http://www.colorado.gov/cs/Satellite?c=Page&cid=1212573833941&pagename=Agriculture-Main/CDAGLayout
The last picture on this post on mullein has a side-by-side comparison of the rosettes of Mullein and Green Gentian: