This is Trillium stenosepalum, the Rocky Mountain trillium, recently elevated to species status. Waiting for the name to become available in iNat. See https://doi.org/10.3120/0024-9637-70.3.158
Observed at 1:34 pm, the weather was cloudy and cold. In a small widely scattered group.
Source: 11/24/23
Dormant and dry remnants of ghost pipes
pretty big guy. Shot at 145 ft tall.