polygonaceous /ˌpɒlɪɡəˈneɪʃəs, pəˌlɪɡə-/

• 1. 

  ADJ of, relating to, or belonging to the Polygonaceae, a chiefly N temperate family of plants having a sheathing stipule (ocrea) clasping the stem and small inconspicuous flowers: includes dock, sorrel, buckwheat, knotgrass, and rhubarb 蓼科的