Wildflowers of Tucson, Arizona
Yellow Wildflower
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Rhynchosida physocalyx - Buffpetal (Tuberous Sida) Rhynchosida physocalyx - Buffpetal (Tuberous Sida)
Scientific Name: Rhynchosida physocalyx (Sida physocalyx)
Common Name: Buffpetal, Tuberous Sida
Flower Color: Light buffy yellow
Plant Type: Subshrub, Herb, Perennial
Height: To 16 inches (41 cm) tall, but mostly trailing
Date Observed: September 21, 2005
Notes: The 3/4 inch (1.9 cm) wide, 5-petaled flowers have petals equal in length to the green sepals. Each flower and fruit is contained within a large, inflated, 5-ribbed calyx. The leaves have toothed margins and are alternate, oblong to lanceolate, and stiffly hairy.
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