Weed Field Guides

The weed field guides listed below include both invasive weed species and native plant species (rabbitbrush and prickly pear) that can act as weeds under certain conditions. Select a species link for viewing or printing an accessible PDF version of the field guide with Adobe Reader.

African Rue (Peganum harmala)
Buffelgrass (Cenchrus ciliaris)
Bull Thistle (Cirsium vulgare)
Caucasian Bluestem (Bothriochloa bladhii)
Camelthorn (Alhagi pesudalhagi)
Canada Thistle (Cirsium arvense)
Cheatgrass (Bromus tectorum)
Dalmatian Toadflax (Linaria dalmatica)
Diffuse Knapweed (Centaurea diffusa)
Dyer’s Woad (Isatis tinctoria)
Fountain Grass (Pennisetum setaceum)
Giant Reed (Arundo donax)
Green Rabbitbrush (Chrysothamnus viscidiflorus)
Himalayan Blackberry (Rubus armeniacus)
Jointed Goatgrass (Aegilops cylindrica)
Leafy Spurge (Euphorbia esula)
Lehmann Lovegrass (Eragrostis lehmanniana)
Malta Starthistle (Centaurea melitensis)
Meadow Knapweed (Centaurea pratensis)
Musk Thistle (Carduus nutans)
Oxeye Daisy (Leucanthemum vulgare)
Perennial Pepperweed (Lepidium latifolium)
Plumeless Thistle (Carduus acanthoides)
Poison Hemlock (Conium maculatum)
Prickly Pear (Opuntia spp.)
Red Brome (Bromus rubens)
Rubber Rabbitbrush (Chrysothamnus nauseosus)
Rush Skeletonweed (Chondrilla juncea)
Russian Knapweed (Rhaponticum repens)
Russian Olive (Elaeagnus angustifolia)
Sahara Mustard (Brassica tournefortii)
Saltcedar (Tamarix spp.)
Scotch Thistle (Onopordum acanthium)
Siberian Elm (Ulmus pumila)
Spotted Knapweed (Centaurea stoebe)
Squarrose Knapweed (Centaurea virgata)
Sweet Resinbush (Euryops multifidus)
Teasel (Dipsacus fullonum)
Tree-of-heaven (Ailanthus altissima)
Weeping Lovegrass (Eragrostis curvula)
Whitetop (Cardaria draba)
Yellow Bluestem (Bothriochloa ischaemum)
Yellow Starthistle (Centaurea solstitialis)
Yellow Toadflax (Linaria vulgaris)