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American bistort
48%
Bistorta bistortoides
water smartweed
41%
Persicaria amphibia
alpine bistort
34%
Bistorta vivipara
Douglas' knotweed
32%
Polygonum douglasii
milkwort knotweed
29%
Polygonum polygaloides
pale smartweed
27%
Persicaria lapathifolia
spotted ladysthumb
26%
Persicaria maculosa
prostrate knotweed
25%
Polygonum aviculare
Pennsylvania smartweed
24%
Persicaria pensylvanica
alpine knotweed
24%
Koenigia phytolaccifolia
Austin's knotweed
24%
Polygonum austiniae
dotted knotweed
23%
Persicaria punctata
broadleaf knotweed
23%
Polygonum minimum
black bindweed
23%
Fallopia convolvulus
bushy knotweed
22%
Polygonum ramosissimum
Shasta knotweed
22%
Polygonum shastense
Blake's knotweed
22%
Polygonum achoreum
wiry knotweed
22%
Polygonum majus
mild waterpepper
21%
Persicaria hydropiperoides
Davis' knotweed
21%
Koenigia davisiae
scatter knotweed
21%
Polygonum spergulariiforme
Sawatch knotweed
20%
Polygonum sawatchense
water-pepper
19%
Persicaria hydropiper
Parry's knotweed
19%
Polygonum parryi
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