I know this plant as Scarlet Mallow. I saw several plants at this location in the summer and fall of 2021
Found at the walking trails of Outlook and District Regional Park. Area is highly disturbed native prairie, with patches of smooth brome and crested wheat grass invading . As well as weedy areas with thistles and babies breath.
Site is the East bank of the South Saskatchewan River. Soil is a sandy loam. Vegetation is a mix of tree and shrub in coulees (lower slope), followed by short shrub and grass mid slope and shortgrass prairie top slope. (Green ash, chokecherry, Saskatoon, Manchurian elms, Manitoba maple - to - snowberry, smooth brome, crested wheat grass, wheat grass, sand reed grass - to - blue grama, June grass, carex sp.)
Seen at the top of a dry clay bank in the same area as phlox hoodii and Comandra umbellata