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Flower head

Yavapai County Native & Naturalized Plants

Psilostrophe cooperi - whitestem paperflower

Synonyms: Riddellia cooperi
Other Common Names: Paper daisy, Cooper's paper daisy
Plant Form: Forb or Subshrub

Family: Asteraceae

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Flower heads
Max Licher @
Max Licher @
Max Licher @
Forb Plant Description

Origin: Native   Life Cycle: Perennial
General Desc: This nearly round plant makes a brilliant yellow globe.
Identification notes: Plants shrubby; stems and leaves densely white-woolly, distinguishes this species from other Psilostrophe species.
Height: 6 to 24 inches


Habitat Description: Dry slopes and washes of the deserts and plains. Native to the Mojave and Sonoran deserts.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest
Elevation: 300 - 8300 feet

Flower Characteristics

Color: Yellow     Shape: Daisy or dandelion-like not in clusters     Tubular: N     Flowering Period: Apr - Oct
Description: This is a ray flower with 3 to 6 non-overlapping petals borne singly on a stalk. Each petal has 3 shallow lobes at the end.

Leaf and Stem Characteristics

Leaf Color: Grayish-green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Smooth     Leaf Attachment: Alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: The stems are openly branched, erect, and woolly-white. The leaves are 1 to 2-1/2 inches long and very narrow.

Fruit and Seed Characteristics

Fruit Type: Achene
Fruit Notes: Cylindric, ribbed, smooth or sparsely glandular.

  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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