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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
USDA Native Status: L48 (N), CAN (N)
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 plants flowering period. This is followed by sporadic flowering throughout the rest of the summer.
Plant CharacteristicsDuration: Perennial Habit: Herb Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Apr , May , Jun , Jul
, WY Canada: AB
, SK Native Distribution:
Alt. to Man. & e. WI,
s. to e.c. AZ,
& 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
Record Last Modified: 2009-03-10
Research By: TWC Staff