Bigfruit evening primrose
Oenothera macrocarpa Nutt.
- light
- Full sun
- water
- —
- tall
- 46 cm
- wide
- 46 cm
Onagraceae
Also called Missouri evening primrose, Missouri primrose
Formerly Megapterium macrocarpum
When it flowers
Not known yet in the tropics: too few flowering observations to read a season from.
Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- C. & EC. U.S.A. to Mexico (Coahuila)Kew's checklist, not yet checked
- Light
- Full sun (6 h or more)Read from RHS and Wikipedia, checked by a majority of its sourcesBacked by both sources
- Height
- 46 cmRead from RHS and Wikipedia, checked by a majority of its sourcesBacked by both sources. Sources differ: RHS 0.1–0.5 m; Wikipedia 18–18 in
- Spread
- 36 cm to 56 cmRead from RHS and Wikipedia, checked: the middle of what its sources sayHalfway between its 2 sources, which differ. Sources differ: RHS 0.1–0.5 m; Wikipedia 0.6–0.6 m
- Flowers
- YellowRead from RHS and Wikipedia, checked by a majority of its sourcesBacked by both sources
- Coldest it survives
- -15 °C (USDA zone 7b)Read from RHS, one source
Not known yet: grows as, water, heat, hottest it survives.
In other languages (9)
- Czech
- pupalka missourská
- Finnish
- isohelokki
- Japanese
- ケナシミズーリマツヨイグサ
- Swedish
- storblommigt nattljus
- Russian
- Энотера крупноплодная
- French
- Onagre à gros fruits
- Slovak
- pupalka veľkoplodá
- Chinese
- 大果月见草, 密苏里月见草
- Simplified Chinese
- 长果月见草
Where this comes from
- iNaturalist, read 2026-10-25, CC0-1.0 (observation counts)
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- RHS, read 2026-10-25, fact, cited
- Wikipedia, read 2026-10-25, fact, cited
- Wikimedia Commons, read 2026-10-25, Public domain
- iNaturalist, read 2026-10-25, CC0
- iNaturalist, read 2026-10-25, CC BY
- iNaturalist, read 2026-10-25, CC BY
- 3D model: Oenothera macrocarpa (built for Vanagrha) by Vanagrha, own
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.