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Oenothera pilosella ssp. sessilis - Prairie evening primrose
Family: Onagraceae
| Status: |
Global Rank: G5T2Q State Rank: S2 |
Habitat: Unplowed tallgrass prairie remnants and a willow oak (Quercus phellos)-dominated, fragipan flatwoods site (Lafayette County, Arkansas).
Flowering Date: May - June
Fruiting Date: June - July
Causes for Concern: Most of the known occurrences of prairie evening primrose are from unplowed prairie remnants in the Grand Prairie region of eastern Arkansas, where 99.99% of the native prairie has been destroyed. There are fewer than 430 acres of these remnants remaining, over half of which are protected and managed. Other sites are threatened by possible plowing and succession of woody vegetation due to fire suppression. The only known site in Ashley County, Arkansas is believed to have been destroyed.
Global Range: Occurs in southeast Arkansas, west Louisiana, southeast Texas. Not seen in Texas in 115 years.
