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American bistort
50%
Bistorta bistortoides
water smartweed
38%
Persicaria amphibia
alpine bistort
33%
Bistorta vivipara
Douglas' knotweed
29%
Polygonum douglasii
milkwort knotweed
27%
Polygonum polygaloides
pale smartweed
26%
Persicaria lapathifolia
spotted ladysthumb
25%
Persicaria maculosa
alpine knotweed
24%
Koenigia phytolaccifolia
prostrate knotweed
23%
Polygonum aviculare
Austin's knotweed
23%
Polygonum austiniae
bushy knotweed
22%
Polygonum ramosissimum
dotted knotweed
22%
Persicaria punctata
Shasta knotweed
22%
Polygonum shastense
broadleaf knotweed
22%
Polygonum minimum
Blake's knotweed
22%
Polygonum achoreum
black bindweed
22%
Fallopia convolvulus
wiry knotweed
22%
Polygonum majus
mild waterpepper
21%
Persicaria hydropiperoides
scatter knotweed
21%
Polygonum spergulariiforme
Sawatch knotweed
20%
Polygonum sawatchense
water-pepper
19%
Persicaria hydropiper
Parry's knotweed
19%
Polygonum parryi
erect knotweed
19%
Polygonum erectum
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