Scientific Name: Psilostrophe cooperi
Synonym: Riddellia cooperi
Common Names: Whitestem Paperflower, Cooper's Paperflower
Growth Habit: Subshrub, Herb/Forb
Arizona Native Status: Native
Habitat: Desert, Upland. These long-blooming wildflowers are common and widespread in the desert and lower elevation upland areas here.
Flower Color: Brilliant yellow, drying to cream
Flowering Season: Spring, Summer, Fall. The plants bloom repeatedly throughout much of the year.
Height: To 2 feet (61 cm) tall
Description: The flower heads are 1 inch (2.5 cm) wide and have 3 to 6, rounded, cupped, three-toothed rays. The flowers dry to a papery cream color on the plant. The leaves are grayish green, linear, and opposite. The distinctive stems are fuzzy and greenish white in color.
The similar Greenstem Paperflower (Psilostrophe sparsiflora) has green stems, while the also similar Woolly Paperflower (Psilostrophe tagetina) has gray-green stems.
Kingdom: Plantae – Plants
Subkingdom: Tracheobionta – Vascular plants
Superdivision: Spermatophyta – Seed plants
Division: Magnoliophyta – Flowering plants
Class: Magnoliopsida – Dicotyledons
Family: Asteraceae – Aster family
Genus: Psilostrophe DC. – paperflower
Species: Psilostrophe cooperi (A. Gray) Greene – whitestem paperflower
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