goatsbeard, common name for plants of the genus Tragopogon (see salsify ) of the family Asteraceae ( aster family) and of the genus Aruncus of the family Rosaceae ( rose family), related to the spiraeas. False goatsbeard, a saxifrage, is named for its resemblance to Aruncus. The two families are classified in the orders Asterales and Rosales, respectively. These orders belong to the division Magnoliophyta , class Magnoliopsida.

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