Oenothera oakesiana (A. Gray) J.W. Robbins ex S. Watson & Coulter. Oakes's Evening-primrose. Phen: Jun-Aug. Hab: Sandy dunes and sandplains, river-scours, disturbed areas, roadsides. Dist: NS west to MB, south to e. NC (?), VA, PA, n. IN, n. IL, and s. MN.

Origin/Endemic status: Native

Synonymy ⓘ: = FNA10, G, Il, K1, K3, K4, Mi, NE, NY, Pa, Dietrich, Wagner, & Raven (1997), Wagner, Hoch, & Raven (2007); = n/a – RAB, Tat; = Oenothera parviflora L. ssp. parviflora var. oakesiana (A.Gray) Fernald – Munz (1965); = Oenothera parviflora L. var. oakesiana (A.Gray) Fernald – C; < Oenothera biennis L. – Va; > Oenothera cruciata Nutt. var. stenopetala (E.P.Bicknell) Fernald – F; > Oenothera parviflora L. var. oakesiana (A.Gray) Fernald – F

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
• Great Plains: FACU (taxonomic split from wetland indicator species)
• Midwest: FACU (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8