Plant Image
Flower


Yavapai County Native & Naturalized Plants

Oenothera pubescens - South American evening primrose

Synonyms: Oenothera amplexicaulis, O. laciniata ssp. pubescens, O. laciniata var. pubescens
Other Common Names: silky evening primrose, pubescent evening primrose
Plant Form: Forb or Subshrub

Family: Onagraceae


   
 
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Leaves
Arizona State University Vascular Plant Herbarium, Usage Rights: CC BY-NC (Attribution-Non-Commercial)
Plant
Desert Botanical Garden Herbarium, Usage Rights: CC BY-NC (Attribution-Non-Commercial)
Fruit
Patrick Alexander @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Forb Plant Description

Origin: Native   Life Cycle: Annual or perennial
General Desc: Plant has long hairs on the stems, leaves and flower stalks mixed with shorter glandular hairs and stiff, flat hairs. Cross-shaped yellow flowers grow singly from the upper leaf axils (between the leaf and stem). Often 1 bloom opens per day near sunset.
Identification notes: Annual, perennial, basal rosettes of leaves and stem leaves, hairs long, glandular; flowers in leaf axils towards stem ends, yellow, stigmas with 4 narrow lobes, open late afternoon; buds nodding; fruit round in cross-section; seeds in 2 rows per cell.
Height: To about 30 inches


Habitat

Habitat Description: Open woodlands, pine forests, moist places, streambanks, disturbed areas.
Plant Communities: Pinyon Juniper Woodland, Montane Conifer Forest, Riparian, Disturbed Areas
Elevation: 3500 - 9500 feet


Flower Characteristics

Color: Yellow, ages pinkish-orange     Shape: Regular not in clusters     Tubular: Y     Flowering Period: May - Oct
Description: Flower about 1-1/2 inches wide, 4 petals narrowing at base, forms a cross shape. Green leaf-like sepals are hairy, curve backward and are attached to a thin cup-shaped flower tube up to 2 inches long (hypanthium). Flower buds face downward.


Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Toothed     Leaf Attachment: Basal and alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Leaves grow in a circular pattern (rosette) at the plant base and alternately on the stem. Leaves are narrow, often lance-shaped, up to 3 inches long, often lined with irregular points (teeth) but at times may have a smooth margin.


Fruit and Seed Characteristics

Fruit Color: Green   
Fruit Type: Capsule
Fruit Notes: The fruit is a green, elongated, cylinder-shaped, hairy capsule (round in cross-section) ranging from 1/2 to 1-1/2 inches long and 1/16 to 1/4 inch wide. Parallel lines or grooves run lengthwise around the surface of the fruit (striations).
Seed Notes: Numerous seeds are produced by the fruit. Each seed is light brown, about 1/16 inch long with evenly distributed indentations on its surface (pitted) often giving it a flecked appearance.



  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  
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