Oenothera rhombipetala Nutt. ex Torr. & A. Gray
Fourpoint Evening-primrose, Four-point Evening Primrose, Diamond Petal Primrose, Greater Four-point Evening-primrose
Onagraceae (Evening Primrose Family)
Synonym(s): Oenothera heterophylla var. rhombipetala, Raimannia rhombipetala
USDA Symbol: OERH
As a biennial, this plant produces a rosette of leaves the first year and in the second year an erect, leafy stem 1-3+ ft. tall. The loose flowering spike is composed of yellow, 2-3 in. flowers, each with four wide petals which taper to a blunt point. The flowers open in the evening and wither the following morning.
Often seen along roadsides. In the South this plant will continue to bloom through the summer if well watered.
From the Image Gallery
Plant CharacteristicsDuration: Annual
Leaf Retention: Deciduous
Fruit Type: Capsule
Size Notes: Up to about 5 feet tall, often shorter.
Bloom InformationBloom Color: Yellow
Bloom Time: May , Jun , Jul , Aug , Sep , Oct
DistributionUSA: AR , IA , IL , KS , LA , MI , MN , MO , ND , NE , NM , OK , SC , SD , TX , WI
Native Distribution: Locally from n. IN to e. MN & s.w. SD, s. to TX; naturalized eastward
Native Habitat: Prairie, Plains, Meadows, Pastures, Savannas, Woodlands' edge, Opening
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry
Soil Description: Sandy, Sandy Loam
Conditions Comments: This plant can be naturalized in a meadow but it is best in the garden where it receives summer water. It can be grown from seed sown in situ or transplanted when very small as it has a taproot. To bloom, it has to winter over, although it sometimes bloom the first spring. It seeds out best in bare areas and under parent plants so you may want to keep an area just for evening primroses. In the South this plant will continue to bloom through the summer if watered well.
BenefitUse Ornamental: Color, Attractive, Showy
Use Medicinal: Leaves used for poultice.
Conspicuous Flowers: yes
Nectar Source: yes
Value to Beneficial InsectsSpecial Value to Native Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
PropagationPropagation Material: Seeds
Description: Seed sown in fall
Commercially Avail: yes
Maintenance: Prevent complete soil dryness, Remove spent blossoms, Maintain mulch layer, Fertilize in spring with rose food
Find Seed or Plants
Order seed of this species from Native American Seed and help support the Wildflower Center.
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
BibliographyBibref 766 - Dale Groom's Texas Gardening Guide (2002) Groom, D.
Bibref 610 - Edible wild plants of the prairie : an ethnobotanical guide (1987) Kindscher, K.
Bibref 318 - Native Texas Plants: Landscaping Region by Region (2002) Wasowski, S. & A. Wasowski
Bibref 286 - Wildflowers of the Texas Hill Country (1989) Enquist, M.
Search More Titles in Bibliography
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Oenothera rhombipetala in USDA Plants
FNA: Find Oenothera rhombipetala in the Flora of North America (if available)
Google: Search Google for Oenothera rhombipetala
MetadataRecord Modified: 2023-02-21
Research By: DEW, JSC, WFS