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Tufted Evening Primrose

Oenothera caespitosa

photo © by Michael Plagens

Photographed in Rackensack Canyon, Maricopa Co., Arizona. 04 April 2009.

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FLOWERS: Blooming in April. Four large, broad white petals each conspicuously bilobed. The fragrant flowers open at dusk and are bright white through night but then fade pink by early morning and close up completely well before noon. Eight stamens.

RANGE: Mostly in the higher elevations of the Sonoran Desert in Arizona along canyon bottoms and near riparian zones with additional water. Found in suitable habitat throughout much of western North America.

PERENNIAL: Low growing, generally without any upright stem. Numerous stems and flowers from ground level. Clumps may be as much as 50 cm across.

FRUIT: Dry, cylindrical capsules develop below the flower and are about 5 cm long.

LEAVES: Leaves are elongate and are coarsely toothed.

UNARMED. No thorns/spines.

Onagraceae -- Evening Primrose Family

More Information:

Sonoran Desert Field Guide
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Copyright Michael J. Plagens, 1999-2009