Symphyotrichum patagonicum (formerly Aster patagonicus) is a species of flowering plant in the family Asteraceae endemic to the Argentinian provinces of Chubut, Mendoza, Neuquén, and Santa Cruz. It is an annual, herbaceous plant that grows 3 to 30 centimeters (1 to 12 inches) tall. Its flowers have short white ray florets in 3 or 4 series and numerous disk florets.

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