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Yavapai County Native & Naturalized Plants

Oenothera villosa - hairy evening primrose

Plant Form: Forb

Family: Onagraceae

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Max Licher @
Forb Plant Description

Origin: Native   Life Cycle: Biennial or perennial
General Desc: Rosette with erect stems and long narrow leaves. Yellow flowers emerge in small clusters at the top of the stems and upper leaf axils.
Identification notes: Flower spike open, petals are 1/4 to 3/4 inch long; sepals often marked red. The internodes between fruits are usually longer than the fruits. The longest stem and leaf hairs usually with red blister-like bases.
Height: To 6-1/2 feet


Habitat Description: Meadows, shrublands, disturbed areas. Moist openings in forests. Occurs in wetlands and non-wetlands.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Riparian, Disturbed Areas
Elevation: 1500 - 6500 feet

Flower Characteristics

Color: Yellow fading to pale orange     Shape: Regular in elongated clusters     Tubular: N     Flowering Period: Jun - Aug
Description: Sepals often have reddish marks. Petals are 1/4 to 3/4 inch long. Flowers open in the evening.

Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Round or oval     Leaf Margin: Toothed     Leaf Attachment: Basal and alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Basal leaves are spoon-shaped to 4 inches long. Stem leaves are lance-shaped to oval to 1 foot long.

Fruit and Seed Characteristics

Fruit Type: Capsule
Fruit Notes: 3/4 to 1-1/2 inches long, 1/8 to 1/4 inches wide, narrowly lance-shaped, straight.
Seed Notes: Less than 1/8 inch, angled, irregularly pitted.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Feb 16, 2020  
Content Questions/Comments: Email Jeff Schalau  
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