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• Genera
• Species 11

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Polygonum arenarium Waldst. & Kit.

Lesser Red-knotgrass

9 4 Observations

Polygonaceae

Polygonum aviculare L.

Knotgrass

4,982 3,836 Observations

Polygonaceae

Polygonum bellardii All.

Narrowleaf Knotweed

27 11 Observations

Polygonaceae

Polygonum cognatum Meisn.

Indian Knotgrass

36 25 Observations

Polygonaceae

Polygonum equisetiforme Sibth. & Sm.

Horsetail Knotweed

1 1 Observation

Polygonaceae

Polygonum maritimum L.

Sea Knotgrass

702 361 Observations

Polygonaceae

Polygonum plebeium R.Br.

Least Concern

Common knotweed

3 1 Observation

Polygonaceae

Polygonum raii Bab.

Ray's Knotgrass

83 19 Observations

Polygonaceae

Polygonum robertii Loisel.

 

1 1 Observation

Polygonaceae

Polygonum romanum Jacq.

Least Concern

 

3 2 Observations

Polygonaceae

Polygonum scoparium Req. ex Loisel.

 

59 36 Observations

Polygonaceae

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