Halfshrub Sundrop

Plant Profile
FYUSE Image	Common Name: Halfshrub Sundrop Other Names: Plains Evening Primrose, Yellow Sundrops Species Name: Oenothera serrulata Plant Type: Forb Family Name: Onagraceae, Evening Primrose Family

Plant Facts
Origin	Native
Duration	Perennial
Distribution in the U.S.	The Great Plains and tallgrass prairie from Canada south to Arkansas, Texas, northeastern Mexico and west to Arizona
Distribution in Oklahoma	Throughout the state

ID Characteristics

Field Identification Characteristics
Vegetative
- Branching at woody base
- Narrow, serrated pointed leaves
Floral
- Stamens noticeable and appear to dangle for the center
- Flowers 4-petaled and yellow
Leaf and Stem Characteristics
- Leaf Type: Simple
- Leaf Arrangement: Alternate
- Leaf Shape: Linear
- Stipules: Absent
Floral Characteristics
- Petal Number: 4, unfused
- Flower Color: Yellow
- Flower Timing: June-September
- Fruit Type: Capsules