Plant Image
Flower head
Willow Dells Tr - Sue Smith

Yavapai County Native & Naturalized Plants

Lepidium thurberi - Thurber's pepperweed

Plant Form: Forb

Family: Brassicaceae

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Flower head
Willow Dells Tr
Sue Smith
Willow Dells Tr
Sue Smith
Plant - summer
Willow Dells Tr
Sue Smith
Forb Plant Description

Origin: Native   Life Cycle: Biennial or perennial
General Desc: An erect, branching plant with pinnatifid leaves and hairy stems. The white flowers occur in dense clusters at the tops of the stems. It is a conspicuous white roadside flower.
Identification notes: Perennial, annual or biennial; taprooted; erect branched hairy stems. Leaves pinnatifid or toothed. Flowers on elongated stems; white, 4-petaled, up to 1/4 inch long, petals broad, narrow at base. Fruits 2-chambered pods, each with 2 flattened seeds.
Height: To 2 feet


Habitat Description: Clay soils, roadsides, fields and washes.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Disturbed Areas
Elevation: Below 5000 feet

Flower Characteristics

Color: White     Shape: Regular in round clusters     Tubular: N     Flowering Period: Feb - Sep
Description: The pure white flowers have 4 petals and are 1/4 inch wide. The flowers are in dense clusters at the ends of the leafy, hairy stems.

Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Pinnatifid     Leaf Margin: Dissected     Leaf Attachment: Basal and alternate     Leaves Clasp: N
Hairs: Stems     Spines: N
Leaf Description: The light green basal leaves are nearly hairless and pinnately divided up to 2-1/2 inches long, divided into 3 to 8 pairs of narrow lobes, stem leaves reduced but similar to basal leaves.

Fruit and Seed Characteristics

Fruit Color: Green to brown   
Fruit Type: Pod
Fruit Notes: Rounded or elliptical pod with small notch.
Seed Notes: Seeds are oblong and less than 1/8 inch in size.

  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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