Species from central North America
Common name: Showy evening primrose
This species is native to these prairies.
Photographed at Terre Noir Natural Area, Clark County, Arkansas
Among the many pines and oaks in Corona Heights I found a few Eucalpytus trees. They are defined by their broad leaves, white and grey bark color, and bark that has a tendency to flake off the tree.
Calylophus berlandieri ssp. pinifolius (Engelm. ex Gray) Towner
Berlandier's sundrops, Square-bud primrose, Sundrops, Square-bud day-primrose
Onagraceae (Evening-Primrose Family)
I have been trying to pin down this flower and probably have called it other things on iNat. But this looks like what they have on wildflowers.org as this subspecies