PCA's Alien Plant Working Group Least Wanted: Alien Plant Invaders of Natural Areas

Fact Sheets for Herbaceous Plants

Goutweed (Aegopodium podagraria)
Garlic mustard
(Alliaria petiolata)

Giant reed (Arundo donax)
Musk thistle (Carduus nutans)
Asiatic sand sedge (Carex kobomugi)

Spotted knapweed (Centaurea biebersteinii)
Yellow starthistle (Centaurea solstitialis)
Canada thistle (Cirsium arvense)
Leafy spurge (Euphorbia esula)
West Indian marsh grass (Hymenachne amplexicaulis)
Cogon grass (Imperata cylindrica)
Perennial pepperweed (Lepidium latifolium)
Chinese lespedeza (Lespedeza cuneata)
Tall fescue (Lolium arundinaceum)
Purple loosestrife (Lythrum salicaria)
Japanese stiltgrass
(Microstegium vimineum)
Updated
Eurasian watermilfoil (Myriophyllum spicatum)
Burma reed (Neyraudia reynaudiana)
Fountain grass (Pennisetum setaceum)
Common reed (Phragmites australis)
Japanese knotweed (Polygonum cuspidatum)

Lesser celandine (Ranunculus ficaria)
Annual bastard-cabbage (Rapistrum rugosum)
Smooth cordgrass (Spartina alterniflora)
Common mullein (Verbascum thapsus)

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http://www.nps.gov/plants/alien/herbs.htm
Last updated: 21-Mar-2008