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42 knotweeds species
Polygonum aviculare
Polygonum paronychia
Polygonum douglasii
Polygonum achoreum
Polygonum tenue
Polygonum polygaloides
Polygonum minimum
Polygonum spergulariiforme
Polygonum ramosissimum
Polygonum arenastrum
Polygonum buxiforme
Polygonum majus
Polygonum shastense
Polygonum fowleri
Polygonum austiniae
Polygonum engelmannii
Polygonum nuttallii
Polygonum cascadense
Polygonum erectum
Polygonum raii
Polygonum sawatchense
Polygonum parryi
Polygonum heterosepalum
Polygonum patulum
Polygonum polycnemoides
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