One of the mysteries of the English language finally explained.
Belonging or relating to the family Polygonaceae, which includes docks, sorrels, and knotweeds and of which the type genus is Polygonum.
Mid 19th century; earliest use found in Quarterly Journal of the Geological Society of London. From polygonum or its etymon post-classical Latin Polygonum + -aceous, after scientific Latin Polygonaceae, family name (J. Lindley Nat. Syst. Bot (ed. 2, 1836) 211, replacing earlier † Polygoneae (A. L. de Jussieu Genera plantarum 82)).
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