Description: English: Critically endangered meadow species from Arkansas. Also found in one county each in Texas and Louisiana. Photographed at Railroad Prairie Natural Area, Prairie County, Arkansas. Date: 12 May 2019, 06:08:07. Source: Own work. Author: Eric Hunt.
Description: English: Oenothera pilosella. Date: 18 March 2012. Source: http://plants.usda.gov/java/largeImage?imageID=oepi2_001_ahp.tif. Author: Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln. Courtesy of USDA NRCS Wetland Science Institute.