Calylophus serrulatus (Nutt.) P.H. Raven
Yellow Sundrops, Yellow Evening Primrose, Plains Evening Primrose
Onagraceae (Evening Primrose Family)
Synonym(s): Calylophus australis, Meriolix intermedia, Meriolix oblanceolata, Meriolix serrulata, Oenothera serrulata, Oenothera serrulata var. typica
USDA Symbol: CASE12
Yellow sundrops or yellow evening primrose is a leafy, bushy perennial from 8-20 in. tall. Narrow leaves crowd the branched stems. Small, yellow, four-petaled flowers are borne from the upper leaf axils.
The best bloom occurs at the beginning of the plant's flowering period. This is followed by sporadic flowering throughout the rest of the summer.
From the Image Gallery
Bloom InformationBloom Color: Yellow
Bloom Time: Apr , May , Jun , Jul
DistributionUSA: AR , AZ , CO , IA , IL , IN , KS , KY , MI , MN , MO , MT , ND , NE , NM , OK , SD , TX , WI , WY
Canada: AB , SK
Native Distribution: Alt. to Man. & e. WI, s. to e.c. AZ, e. NM & n. TX
Native Habitat: Dry, open plains & prairies
Growing ConditionsLight Requirement: Sun
Soil Moisture: Dry
Soil Description: Dry, well-drained soil.
PropagationDescription: Cuttings taken in early summer will root. Stratified seed germinates adequately.
Seed Collection: Seed is difficult to collect.
Seed Treatment: Not Available
Commercially Avail: yes
Herbarium Specimen(s)NPSOT 0417 Collected May 28, 1987 in Bexar County by Harry Cliffe
BibliographyBibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
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Additional resourcesUSDA: Find Calylophus serrulatus in USDA Plants
FNA: Find Calylophus serrulatus in the Flora of North America (if available)
Google: Search Google for Calylophus serrulatus
MetadataRecord Modified: 2009-03-10
Research By: TWC Staff