Species Detail Forb

Flower		Yavapai County Native & Naturalized Plants Oenothera albicaulis - whitest evening primrose Synonyms: Anogra albicaulis, Oenothera ctenophylla Other Common Names: white-stem evening-primrose, pale evening-primrose, prairie evening primrose, halfshrub sundrop Plant Form: Forb or Subshrub Family: Onagraceae
Flower


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Basal leaves Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)	Plant Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)

Forb Plant Description

Origin: Native Life Cycle: Annual
General Desc: Roundish gray-green plant with showy white flowers. Flowers can fade to pale pink as they age.
Identification notes: Hypanthium tube (cup-shaped extension of floral parts) without long hairs in the throat; petals 1/2 to 1-1/2 inches long. Flowers white; buds nodding. Seeds in 2 rows in each cell, with shallow pits in regular rows.
Height: 1 to 1-1/2 feet

Habitat

Habitat Description: Dry, grassy, sandy or disturbed areas.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 2500 - 7500 feet

Flower Characteristics

Color: White Shape: Regular not in clusters Tubular: N Flowering Period: Mar - Aug
Description: Flowers are made up of four white, heart-shaped petals, to 1-1/2 inches wide. Flowers open near sunset and remain open for several days. The petals are white when fresh and the stamens are of equal length. Flowers arise individually from upper leaf axils.

Leaf and Stem Characteristics

Leaf Color: Grayish-green Leaf Type: Simple Leaf Shape: Pinnatifid Leaf Margin: Lobed Leaf Attachment: Basal and alternate Leaves Clasp: N
Hairs: Leaves and stems Spines: N
Leaf Description: The basal leaves grow to 2 inches in length with variable shapes and may have smooth or lobed edges. The leaves growing from the stems are long and thin. The hairs on the stems give a whitish appearance.

Fruit and Seed Characteristics

Fruit Color: Yellowish-brown
Fruit Type: Capsule
Fruit Notes: The fruits are cylindrical capsules containing many seeds.
Seed Notes: Seeds ellipsoid, yellowish-brown, pitted, in 2 rows in each compartment.


	Arizona Cooperative Extension Yavapai County 840 Rodeo Dr #C Prescott, AZ 86305 (928) 445-6590	Version 8.0 http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php Last Updated: Dec 13, 2022 Content Questions/Comments: Email Matt Halldorson Legal Disclaimer