Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Calylophus serrulatus (Nutt.) P.H.Raven image
Photographer: Emmet J. Judziewicz           

Emmet J. Judziewicz

Emmet J. Judziewicz

Emmet J. Judziewicz

Emmet J. Judziewicz
Family Onagraceae
Calylophus serrulatus (Nutt.) P.H.Raven
yellow evening-primrose, yellow sundrops
Calylophus: Caly Greek for calyx; lophos for "the back of the neck; crest of a hill or helmet"
serrulatus: minutely serrate or saw-toothed
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Special Concern
Plant: erect, perennial, to 24" tall forb; stems usually clustered, often woody at the base
Flower: yellow, 4-parted, 1/3"-1" wide, stalkless, sepals with sharply raised midrib, 8 stamens, stigma shield-shaped; solitary from the upper leaf axil; blooms June-July
Leaf:many, narrowly oblong, often toothed
Habitat: dry; prairies, plains, bluffs

More Information Natural Communities Herbarium Specimens
All Calylophus list Google- Images or Text
Calylophus australis Towner & P.H.Raven
Meriolix intermedia Rydb. ex Small
Meriolix oblanceolata Rydb.
Meriolix serrulata (Nutt.) Walp.
Oenothera serrulata Nutt.
Oenothera serrulata Nutt. var. typica Munz

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