Oklahoma's Least Wanted - list of expected, rare, and vulnerable plants

Asteraceae
Carduus nutans (Nodding plumeless thistle, Musk thistle)
Onopordum acanthium (Scotch cottonthistle, Scotch thistle)
Cirsium arvense (Canada thistle)

Amaranthaceae
Alternanthera philoxeroides (Alligatorweed)

Caprifoliaceae
Lonicera japonica (Japanese honeysuckle)

Chenopodiaceae
Kochia scoparia (Mexican fireweed)
Salsola collina (Slender Russian thistle)
Salsola tragus (Prickly Russian thistle)

Fabaceae
Lespedeza sericea (Chinese lespedeza)
Pueraria montana (Kudzu)

Haloragaceae
Myriophyllum aquaticum (Parrot Feather watermilfoil)

Hydrocharitaceae
Egeria densa (Brazilian waterweed)

Lythraceae
Lythrum salicaria (Purple loosestrife)

Oleaceae
Ligustrum sinense (Chinese privet)

​Poaceae
Bromus japonicus (Japanese brome)
Bromus tectorum (Cheatgrass)
Sorghum halepense (Johnsongrass)

​Tamaricaceae
Tamarix chinensis (Fivestamen tamarisk)
Tamarix parviflora (Smallflower tamarisk)
Tamarix ramosissima (Saltcedar)