Oenothera biennis
(Yellow Evening-Primrose)

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Whole Plant in Ground

Upper Plant in Ground

Early Flower in Ground

Later Flower in Ground

Whole Plant

Whole Plant

Lower Third of Plant

Middle Third of Plant

Upper Third of Plant

Upper Stem

Middle Stem

Middle Stem

Lower Leaf Top

Lower Leaf Bottom

Middle Leaf Top

Middle Leaf Bottom

Upper Leaf Top

Upper Leaf Bottom

Middle Leaf Top Close-Up

Middle Leaf Bottom Close-Up

Several Flowers

Flower Side

Flower Top

Flower Top/Side

Flower Side,
Bract & One Petal Removed

Flower Side,
Bract & All Petals Removed

One Stamen, Style, and Stigma

Floral Tube Cut Open

Bract Top

Bract Bottom

Sepal Top

Sepal Bottom


Ovary Longitudinal Section

Stigma Top

Early Fruit