Oakes' Evening Primrose (Oenothera oakesiana) (A. Gray, 1867)

 

Synonyms: Oenothera parviflora var. oakesiana, Oenothera biennis var. oakesiana, Oenothera ammophila, Onagra oakesiana, Oake's Evening-primrose

 

 

Oenothera oakesiana is native to northeastern North America, including the Great Lakes basin, New England, the Maritime provinces of Canada, and the island of Newfoundland; south to North Carolina (Map). It grows on sandy or rocky shores, dunes, meadows, clearings, roadsides, and fields; alongside streams in pine barrens. An annual herb with erect or ascending hirsute stem, simple or sparsely branched, 0.5-2 m tall. The leaves are simple, lanceolate or elliptic, entire or serrated. The radially symmetrical flowers are borne in the axils of the upper leaves; sessile with 4 greenish or yellow sepals, and 4 pale yellow petals; open at twilight. The fruit is a capsule. O. oakesiana is closely related to O. biennis (and was formerly included in the latter).

 

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