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Bransford, W.D. and Dolphia
Psilostrophe cooperi (A. Gray) Greene
White-stem paper-flower, Whitestem paperflower, Yellow paper daisy
Synonym(s): Riddellia cooperi
USDA Symbol: PSCO2
USDA Native Status: L48 (N)
White-stem paper-flower is a small, deciduous sub-shrub with many erect, white-woolly stems rising 8-20 in. from the base. Flowers are showy and yellow, terminating the upper branches. Many well-branched leafy stems, woolly at the base, form a nearly round plant covered with loose wool, usually bearing only one yellow flower head at the end of each branch. The ray flowers turn papery and persist long after they have lost their yellow color.
White-stem Paperflower forms brilliant yellow globes. Its rays become dry and papery, remaining on the plant long after flowering. There are several closely related species.
Plant CharacteristicsDuration: Perennial Habit: Shrub Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Apr , May , Jun , Oct , Nov , Dec
, UT Native Distribution:
Extreme s.w. UT
& w. NM
to s. CA
& n.w. Mex. Native Habitat:
Deserts & mesas; 2000-5000 ft.
Growing ConditionsLight Requirement:
Sun Soil Moisture:
Dry Soil Description:
Rocky soils. Conditions Comments:
The main bloom period is in spring, but if summer rains have been good, the plants will flower
again in fall.
Record Last Modified: 2007-01-01
Research By: TWC Staff