Oenothera speciosa is a species of evening primrose known by several common names, including pinkladies, pink evening primrose, showy evening primrose, Mexican primrose, amapola, and even "buttercups". It is a herbaceous perennial wildflower.
The pink evening primrose is used in the temperate latitudes as an ornamental plant. However, it does not survive a severe winter. It is a ground cover. While it makes an attractive garden plant, care should be taken with it as it can become invasive, spreading by runners and seeds. This drought-resistant plant prefers loose, fast-draining soil and full sun. The plant's wild habitat includes rocky prairies, open woodlands, slopes, roadsides, meadows and disturbed areas.