buckwheat family

American  

noun

1. the plant family Polygonaceae, characterized by herbaceous plants, vines, shrubs, and trees having stems with swollen joints, simple leaves, small, petalless flowers, and fruit in the form of an achene, and including the buckwheat, dock, knotweed, rhubarb, sea grape, and smartweed.

---

Example Sentences

Rhubarb is part of the buckwheat family, which also includes plants like Japanese knotweed and sorrel.

From Salon • Mar. 20, 2022

Polygonā′ce�, an order of apetalous plants, mostly herbs—the buckwheat family.

From Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) by Various