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42 knotweeds species
Polygonum rurivagum
Polygonum humifusum
Polygonum maritimum
Polygonum californicum
Polygonum arenarium
Polygonum bellardii
Polygonum boreale
Polygonum gabrielae
Polygonum oxyspermum
Polygonum marinense
Polygonum hickmanii
Polygonum parryi
Polygonum heterosepalum
Polygonum patulum
Polygonum polycnemoides
Polygonum glaucum
Polygonum utahense
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