Plant Image
Flower heads

Yavapai County Native & Naturalized Plants

Hymenoxys cooperi - Cooper's rubberweed

Plant Form: Forb

Family: Asteraceae

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Max Licher @
Max Licher @
Forb Plant Description

Origin: Native   Life Cycle: Biennial or annual
General Desc: Lacey, multiple stemmed plant with leaves primarily at the base. Multiple bright yellow flowers top each stem.
Identification notes: Mid leaves divided into 3 to 7 linear or filament shaped lobes less than 2 mm wide. Flowers and sets seeds once (monocarpic). Leaves are somewhat hairy. In Arizona there are twelve different species of Hymenoxys.
Height: To 3 feet


Habitat Description: Plant grows in dry, rocky areas, along roadsides, in open areas, and the edges of juniper-pine forests.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 2000 - 8000 feet

Flower Characteristics

Color: Bright yellow     Shape: Daisy or dandelion-like not in clusters     Tubular: N     Flowering Period: May - Sep
Description: There are numerous stalks of flowers which have straggly rays and orangish disks. The flowers grow to 1 inch wide and the stalks are up to 4 inches long.

Leaf and Stem Characteristics

Leaf Color: Grayish-green     Leaf Type: Simple     Leaf Shape: Pinnatifid     Leaf Margin: Lobed     Leaf Attachment: Alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: The leaves are narrow and pointed with two lateral lobes that form a trident shape. The foliage and stems are glandular and waxy, usually with a fine coat of light colored hairs.

Fruit and Seed Characteristics

Fruit Color: Brownish   
Fruit Type: Achene

  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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