peirsonii, commonly known as Peirson's brown-eyed evening primrose, is a subspecies of flowering plant in the family Onagraceae.

It has a basal rosette of lanceolate to narrowly ovate leaves that are often toothed or lobed along the edges, and erect stems that can reach heights of up to 70 cm (27.5 in).

The attractive, bowl-shaped flowers have four petals and range in color from yellow to pale pink.

The subspecies is adapted to survive in arid environments with low precipitation and high temperatures.

However, like many native species, it faces challenges due to habitat loss and fragmentation caused by urbanization and agriculture.