Italian Thistle

Carduus pycnocephalus

Plumeless Thistle

Carduus acanthoides

Musk Thistle

Carduus nutans

Scotch Thistle

Onopordum acanthium

Turkish thistle

Carduus cinereus

Milk Thistle

Silybum marianum

Slenderflower Thistle

Carduus tenuiflorus

Marsh Thistle

Cirsium palustre

Bull Thistle

Cirsium vulgare

Canada Thistle

Cirsium arvense

Woolly Distaff Thistle

Carthamus lanatus

Buffalobur

Solanum rostratum

Russian Knapweed

Rhaponticum repens

Malta starthistle

Centaurea melitensis

Yellow Starthistle

Centaurea solstitialis

Perennial Sowthistle

Sonchus arvensis ssp. arvensis