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


Ovary Longitudinal Section


Stigma Top


Early Fruit