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Oenothera argillicola

Shale barren evening primrose

Oenothera caespitosa var. navajoensis

Oenothera californica subsp. californica

Oenothera cavernae

Oenothera coloradensis subsp. coloradensis

Oenothera brachycarpa

Shortfruit evening primrose

Oenothera rhombipetala

Four-points evening-primrose

Oenothera elata

Hooker's evening primrose

Oenothera fruticosa

Narrow-leaf evening-primrose

Oenothera glazioviana

Large-flower evening-primrose

Oenothera filiformis

Oenothera heterophylla subsp. heterophylla

Oenothera hexandra subsp. hexandra

Oenothera mckelveyae

Oenothera murdockii

Oenothera oakesiana

Oenothera psammophila

Oenothera stricta subsp. stricta

Oenothera xerogaura

Okenia hypogaea