Invading Weeds

Invading Weeds: A Growing Threat to Wisconsin's Biological Diversity (1999)

by Elizabeth J. Czarapata

The author has assembled a villains list of the very worst weeds.

Common Buckthorn (Rhamnus cathartica)
Glossy Buckthorn (Rhamnus frangula)
Siberian Elm (Ulmus pumila)
Tartarian Honeysuckle (Lonicera tatarica)
Morrow's Honeysuckle (Lonicera morrowii)
Bella Honeysuckle (Lonicera x bella)
Japanese Barberry (Berberis thunbergii)
Multiflora Rose (Rosa multiflora)
Dame's Rocket (Hesperis matronalis
Garlic Mustard (Alliaria petiolata)
Purple Loosestrife (Lythrum salicaria)
Reed Canary Grass (Phalaris arundinacea)
Kentucky Bluegrass (Poa pratensis)
Canada Bluegrass (Poa compressa)
Wild Parsnip (Pastinaca sativa)
Spotted Knapweed (Centaurea maculosa)
Canada Thistle (Cirsium arvense)
Musk or Nodding Thistle (Carduus nutans)
Plumeless or Bristly Thistle (Carduus acanthoides)
Bull Thistle (Cirsium vulgare)
Yellow Sweet Clover (Melilotus officinalis)
White Sweet Clover (Melilotus alba)
Common Teasel (Dipsacus sylvestris)
Cut-leaved Teasel (Dipsacus laciniatus)
Crown Vetch (Coronilla varia)
Leafy Spurge (Euphorbia esula)
Eurasia Water Milfoil (Myriophyllum spicatum)
Black Locust (Robinia pseudoacacia)

The author considers one native plant as bad as the above listed crowd.

Poison Ivy (Toxicodendron radicans)