

How to identify Common evening-primrose (Oenothera biennis)
Common evening-primrose, also known as King's cure-all, German rampion
Common evening-primrose is a sturdy biennial plant that stands erect with a height typically ranging from 3 to 5 feet (approximately 90 to 150 cm). It features a rosette of lance-shaped leaves at the base and spirally arranged on the stem, with a furry texture. The striking yellow flowers, which bloom at dusk and close by morning, are about 1 to 2 inches (2.5 to 5 cm) in diameter with a cross-shaped arrangement of four petals. After flowering, common evening-primrose produces a narrow capsule, up to 1.5 inches (around 4 cm) long, containing up to 100 seeds. The entire plant dies post seed-setting.
Sturdy plant, 3-5 feet tall (90-150 cm), with lance-shaped leaves in rosette and on stem.
Striking yellow flowers, 1-2 inches (2.5-5 cm) wide, closing by morning, with cross-shaped petals.
Hairy, reddish-green upright stem, 3-5 feet tall (90-150 cm), with spirally arranged leaves.
Elliptic to lance-shaped leaves, 4-8 inches long (10-20 cm), light green, wavy-toothed margin.
Distinctive evening blooming pattern, lemon-yellow bowl-shaped flowers, closure in daytime heat.
The leaves of common evening-primrose are elliptic to lance-shaped, measuring 4-8 inches (10-20 cm) long and 2 inches (5 cm) wide. They exhibit a light green to olive green coloration with a wavy-toothed margin. The leaves are stalkless, forming a basal rosette in the first year. They have a shallow-toothed surface and distinctive vein patterns, enhancing their lanceolate, elongated form.
Common evening-primrose flowers are characterized by their pale lemon-yellow, bowl-shaped petals, each measuring 1-2 inches (2.5-5 cm) across. These blossoms feature four petals, four sepals, eight stamens, and a prominent style with a cross-shaped stigma. Arranged in a multi-flowered terminal panicle, these flowers bloom in the evening and stay open through the morning, closing in the heat of the day. This unique blooming pattern and appearance make them easily recognizable.
The stem of common evening-primrose is upright, hairy, and reddish-green, reaching heights of 3-5 feet (90-150 cm). It features a robust structure with multiple stems possible, showcasing spirally arranged leaves. The texture is notably hairy, providing a distinct tactile quality. The stem's color varies from reddish hues to green and is characterized by its rigidity and firmness. Branching occurs, culminating in a standout summer to fall bloom. These key features facilitate the plant's identification.
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Scientific Classification of Common evening-primrose