Psilostrophe cooperi, Whitestem Paperflower
Scientific Name: Psilostrophe cooperi
Common Name: Whitestem Paperflower
Also Called: Cooper's Paperflower, Paper Daisy, Paper Flower, Paperflower and Whitestem
Family: Asteraceae, Sunflower Family
Synonyms: (Riddellia cooperi)
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.
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.
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.