Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Psilostrophe cooperi, Whitestem Paperflower

Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora   Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora   Psilostrophe cooperi, Whitestem Paperflower, Southwest Desert Flora


Scientific Name: Psilostrophe cooperi
Common Name: Whitestem Paperflower
Also Called: Cooper's Paperflower, Paper Daisy, Paper Flower, Paperflower, Whitestem
Family: Asteraceae, Sunflower Family
Synonyms: (Riddellia cooperi)
Status: Native
Duration: Perennial
Size: Up to 1 foot, twice as wide.
Growth Form: Forb/herb, subshrub; mounded, stems and branches covered with a whitish felt-like wool (tomentose).
Leaves: Green, or gray-green; alternate, linear or narrowly lanceolate, new leaves tomentose, 2 or more inches long.
Flower Color: Yellow; showy flowers mostly single heads on slender stems; radiate heads, ray flowers with 3 to 6 petal-like rays, disk flowers 10 to 25, about 5 ray or so flowers; fruit is an achene.
Flowering Season: February to September, mostly spring through fall but may bloom year-round.
Elevation: 2,000 to 5,000 feet.
Habitat Preferences: Lower and upper deserts, Creosote Bush communities, dry areas, mesas, plains and sand and gravel washes.
Recorded Range: Found in the southwestern United States, Baja California and northern Mexico. Recorded in most of Arizona, few records for Apache, Yuma and La Paz Counties.

North America & US County Distribution Map for Psilostrophe cooperi.

U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.

Genus Information: 5 species in Psilostrophe in the southern half of western United States and Idaho. 3 species in Arizona.

Comments: Whitestem Paperflower is a common but showy plant so named because the yellow ray flowers that persist on the flower head after blooming, then turn tannish-yellow and papery in appearance.

Whitestem Paperflower will be found in both the Sonoran and Mojave Deserts.

Date Profile Completed: 7/7/2012; Updated, 07/26/2015
References:
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles
The Jepson Manual, Citation: http://ucjeps.berkeley.edu/interchange/I_treat_indexes.html Tue Aug 7 06:26:15 2012
John L. Strother, FNA | Family List | FNA Vol. 21 | Asteraceae | Psilostrophe, Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford. (accessed 07/07/2012)
SEINet for synonyms, scientific names and recorded geographic locations, http://swbiodiversity.org/seinet/