Yellow Evening Primrose

Oenothera elata variety hirsutissima. Synonym: Oenothera hookeri. (Tall Yellow Evening Primrose)
Onagraceae (Evening Primrose Family) ...

Oenothera flava. Yellow Evening Primrose.
Oenothera spp. Evening Primrose. Chatfield State Park. Denver, Colorado.
Oenothera villosa. Hairy Evening Primrose.