Oenothera triloba Nutt.
Stemless Evening-primrose, Stemless Evening Primrose
Onagraceae (Evening Primrose Family)
Synonym(s): Lavauxia triloba, Lavauxia watsonii, Oenothera hamata
USDA Symbol: oetr2
A winter annual.
From the Image Gallery
Plant CharacteristicsDuration: Annual
Fruit Type: Capsule
Size Notes: Up to about 8 inches tall.
Bloom InformationBloom Color: Orange , Yellow
Bloom Time: Feb , Mar , Apr , May , Jun , Jul
Bloom Notes: Yellow, fading to pale orange.
DistributionUSA: AL , AR , IL , IN , KS , KY , LA , MO , MS , NM , NY , OH , OK , PA , TN , TX , VA
Native Habitat: Found in clay or calcerous soils of the Blackland Praire, Rolling Plains, and Edwards plateau. Dry open areas with drained soil such as prairies, floodplains, slopes, hillsides, rocky fields, and grassy areas. A common lawn invader
Growing ConditionsLight Requirement: Sun
Conditions Comments: This winter annual is good for rock gardens. The plant forms a rosette with broadly lobed leaves low to the ground. The flowers are bright yellow when they open near sunset. They close about noon the following day after fading to a pale yellow.
BenefitConspicuous Flowers: yes
Deer Resistant: High
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: Root Division
Maintenance: Prevent complete soil dryness, Fertilize in spring with rose food, Maintain mulch layer, Remove spent blossoms
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Naval Air Station Kingsville - Kingsville, TX
Fredericksburg Nature Center - Fredericksburg, TX
Lady Bird Johnson Wildflower Center - Austin, TX
Herbarium Specimen(s)NPSOT 0692 Collected Feb 23, 1994 in Bexar County by Mike Fox
NPSOT 0209 Collected Apr. 14, 1992 in Comal County by Mary Beth White
BibliographyBibref 766 - Dale Groom's Texas Gardening Guide (2002) Groom, D.
Bibref 328 - Wildflowers of Texas (2003) Ajilvsgi, Geyata.
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 triloba in USDA Plants
FNA: Find Oenothera triloba in the Flora of North America (if available)
Google: Search Google for Oenothera triloba
MetadataRecord Modified: 2023-02-21
Research By: NPC