Plants in the Buckwheat Family by Scientific Name where Weed includes Yes

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Polygonum
Common Names smart weed, smartweed
Family Buckwheat
Flower Color Pink and Yellowish
Plant Type Forb
Native Yes
Weed Yes

Polygonum argyrocoleon
Common Names erect knotweed
Family Buckwheat
Flower Color Green
Plant Type Forb
Weed Yes

Polygonum coccineum
Common Names water smartweed
Family Buckwheat
Flower Color Pink
Plant Type Forb
Native Yes
Weed Yes

knot bindweed, black bindweed, ivy bindweed, climbing bindweed (Polygonum convolvulus)

Polygonum convolvulus
Common Names knot bindweed, black bindweed, ivy bindweed, climbing bindweed
Family Buckwheat
Plant Type Forb
Introduced Yes
Native No
Weed Yes

Japanese knotweed (Polygonum cuspidatum)

Polygonum cuspidatum
Common Names Japanese knotweed
Family Buckwheat
Plant Type Forb
Native No
Weed Yes