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Oenothera serrulata Nuttall. Plains Sundrops. Phen: Mar-Sep. Hab: Riverbanks, prairies. Dist: ON west to AB, south to w. KY (Jones 2005), w. AR, s. TX, s. NM, and s. AZ.

Origin/Endemic status: Native

Taxonomy Comments: Sometimes treated as Calylophus serrulatus (see synonymy), but better included in a broadly-circumscribed Oenothera, based on Wagner, Hoch, & Raven (2007).

Synonymy: = F, G, Mi, NE, Wagner, Hoch, & Raven (2007); = Calylophus serrulatus (Nutt.) Raven – C, GrPl, Il, K1, NcTx; > Calylophus australis Towner & Raven – Tx; > Calylophus serrulatus (Nutt.) Raven – Tx; > Meriolix drummondiana (Spach) Small – S13; > Meriolix intermedia Rydb. – S13; > Meriolix serrulata (Nutt.) Walp. – S13; > Meriolix spinulosa (Torr. & A.Gray) – S13; < Oenothera serrulata Nutt. – FNA10, K3, K4

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Heliophily: 9

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image of plant© Kelly Bostian, some rights reserved (CC BY), uploaded by Kelly Bostian source CC-BY | Original Image ⭷ Warning: was NOT research grade.
image of plant© Cody Stricker, some rights reserved (CC BY), uploaded by Cody Stricker source CC-BY | Original Image ⭷ Warning: was NOT research grade.
image of plant© Nathan May, some rights reserved (CC BY), uploaded by Nathan May source CC-BY | Original Image ⭷ Warning: was NOT research grade.
image of plant© johnyochum, some rights reserved (CC BY), uploaded by johnyochum source CC-BY | Original Image ⭷ Warning: was NOT research grade.
image of plant© Cody Stricker, some rights reserved (CC BY), uploaded by Cody Stricker source CC-BY | Original Image ⭷ Warning: was NOT research grade.

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