Oenothera triloba, with common names stemless evening primrose and sessile evening primrose[1] is a flowering plant in the primrose family. It is native to North America, where it is primarily found in northern Mexico and in the south-central United States.[2] It is found in dry, open areas such as glades, prairies, and sometimes even lawns. It appears to respond positively to soil disturbance.[3][4]
It is a winter annual that produces large yellow flowers in the spring. The flowers open near sunset.[3]
^USDA GRIN Taxonomy, retrieved 15 June 2016
^"Oenothera triloba". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 17 January 2017.
^ abShinners and Mahler's Illustrated Flora of North Central Texas Online
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