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Serrate-leaf evening primrose

Also known as: Plains yellow primrose

Oenothera serrulata Nutt.

[=Calylophus serrulatus (Nutt.) Raven ]

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Serrate-leaf evening primrose flower
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose flower
Serrate-leaf evening primrose stamens and stigma
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose habit
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose
Serrate-leaf evening primrose sepals and leaves

Morphology

Stem
Erect or decumbent, few to many, simple or branched from base, glabrous or hairy.
Leaves
Alternate, simple, sessile, linear-oblong to narrowly lanceolate, 1/2 to 4 inches long, less than 1/2 inch wide, nearly glabrous or hairy above, gray-hairy below, often folded lengthwise; margins toothed or entire; tips pointed to rounded.
Inflorescence
Solitary flowers, in axils of upper leaves.
Flower
1-2 inches wide, floral tubes less than 3/5 inch long; sepals 4, distinctly keeled; petals 4, 1/4 to 3/4 inch long, about as wide, bright yellow, fading to pale yellow or pinkish; stamens 8; stigma disc-shaped, 4-lobed, extending nearly to tips of stamens.
Fruit
Capsules, linear-cylindric, 1/2 to 1 inch long, 4-angled, thick-walled, slightly grooved, silvery-hairy; seeds many, small, brown.

Ecology

Habitat
Dry rocky, gravelly, or sandy prairies, hillsides, roadsides, and open woods.
Distribution
Throughout Kansas.

Practical Information

Forage Value
Serrate-leaf evening primrose is palatable and nutritious to livestock, particularly the new growth. It decreases on overgrazed rangeland.

Additional Notes

Comments

Serrate-leaf evening primrose is drought resistant. In addition to an extensive root system, the leaves fold in the midday sun, reducing water loss through their surfaces.

Synonyms

Alternative scientific names that have been used for this plant.

Scientific Name: Calylophus serrulatus

Full Citation: Calylophus serrulatus Raven

Quick Facts
Plant Type
Wildflower
Family
Onagraceae - Evening Primrose Family
Life Span
Perennial
Height
6-30 inches
Last Updated
2021-08-27
Color Groups
Yellow Wildflowers
Flowering Period
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Blooms: May, June, July, August