Oenothera longissima Rydb.  

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Family: Onagraceae

Long-Stem Evening-Primrose, more...longstem evening primrose, longstem evening-primrose, longstem eveningprimrose

[Oenothera longissima subsp. clutei (A. Nels.) Munz, moreOenothera longissima subsp. typica Munz, Oenothera longissima var. clutei (A. Nels.) Munz, Oenothera longissima var. longissima Rydb.]