I could not find a specific species for this observation, but I believe based off of flower size and coloration and leaf shape that it is apart of the Mustard Family. The specimen is bright yellow with faint green leaves. The leaves were slightly fuzzy and thin. Located off of Elizabeth St, Fort Collins, CO (80521) in a field.
aka Eustoma exaltatum, but I defer to Ackerfield who uses this name
Field behind house in clay and shale
Not very fragrant. Bush maybe 1 to 1.5 feet tall x 1.5 to 2 feet diameter.