Alaska’s most (un)wanted invasive species

Centaurea stoebe
spotted knapweed

invasive rank score: 86

Lythrum salicaria
purple loosestrife

invasive rank score: 84

Melilotus alba
White sweetclover

invasive rank score: 81

Hieracium caespitosum
meadow hawkweed

invasive rank score: 79

Bromus tectorum
cheatgrass

invasive rank score: 78

Cirsium arvense
Canada thistle

invasive rank score: 76

Prunus padus
European bird cherry

invasive rank score: 74

Vicia cracca
bird vetch

invasive rank score: 73

Caragana arborescens
Siberian pea shrub

invasive rank score: 66

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