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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Onagraceae: Evening-primrose

Flowers that usually bloom before noon. Usually 4 petals, 4 sepals, and 4 or 8 stamens (except Circaea with parts in 2's). The center of the flower, the stigma, often forms a characteristic cross. Leaves simple.
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Flower Formula:  Sepals 2 or 4; Petals 2 or 4 Glossary

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Photo Genus Traits Google Searches
3 Photo of Circaea White, tiny, 2 petaled flowers. Leaves opposite. Images   Information
false-loosestrife, seed-box
3 Photo of Ludwigia Yellow, grren or no petals. Sepals staying on seed. Images   Information
4 Photo of Gaura White to pink flowers with all 4 petals coming from 1 side of blossom. Images   Information
fireweed, willow-herb
11 Photo of Epilobium White, pink, or purple flowers with 4 petals. Seeds with tufts of hairs Images   Information
1 Photo of Calylophus Yellow to whitish flowers. Sepal falling after blooming. Seeds with no hairs. Stigma shield-shaped. Images   Information
evening-primrose, sundrops
13 Photo of Oenothera Yellow to whitish flowers with 4 petals. Sepal falling after blooming. Seeds with no hairs. Stigma with 4 cuts. Leaves alternate Images   Information

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