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• corn cockle, corn campion, crown-of-the-field, Agrostemma githago go
  European annual having large trumpet-shaped reddish-purple flowers and poisonous seed
  
• knawel, knawe, Scleranthus annuus go
  widely distributed low-growing Eurasian herb having narrow leaves and inconspicuous green flowers
  
• corn spurry, corn spurrey, Spergula arvensis go
  small European weed with whorled leaves and white flowers
  
• sand spurry, sea spurry, Spergularia rubra go
  prostrate weedy herb with tiny pink flowers
  
• carpetweed, Indian chickweed, Molluga verticillata go
  annual prostrate mat-forming weed having whorled leaves and small greenish-white flowers
  
• alligator weed, alligator grass, Alternanthera philoxeroides go
  prolific South American aquatic weed having grasslike leaves and short spikes of white flowers
  
• rockcress, yellow rocket, rocket cress, Barbarea vulgaris, Sisymbrium barbarea go
  noxious cress with yellow flowers
  
• wormseed mustard, Erysimum cheiranthoides go
  slender yellow-flowered European mustard often troublesome as a weed
  
• jointed charlock, wild radish, wild rape, runch, Raphanus raphanistrum go
  Eurasian weed having yellow or mauve or white flowers and podlike fruits
  
• pennycress go
  any of several plants of the genus Thlaspi
  
• ambrosia, ragweed, bitterweed go
  any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
  
• thistle go
  any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves
  
• Barnaby's thistle, yellow star-thistle, Centaurea solstitialis go
  European weed having a winged stem and hairy leaves
  
• horseweed, Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis go
  common North American weed with linear leaves and small discoid heads of yellowish flowers
  
• fireweed, Erechtites hieracifolia go
  an American weedy plant with small white or greenish flowers
  
• king devil, yellow hawkweed, Hieracium praealtum go
  European hawkweed introduced into northeastern United States
  
• cat's-ear, California dandelion, capeweed, gosmore, Hypochaeris radicata go
  European weed widely naturalized in North America having yellow flower heads and leaves resembling a cat's ears
  
• bastard feverfew, Parthenium hysterophorus go
  tropical American annual weed with small radiate heads of white flowers
  
• bitterweed, oxtongue, bristly oxtongue, bugloss, Picris echioides go
  widespread European weed with spiny tongue-shaped leaves and yellow flowers
  
• orange hawkweed, Pilosella aurantiaca, Hieracium aurantiacum go
  European hawkweed having flower heads with bright orange-red rays
  
• threadleaf groundsel, Senecio doublasii go
  bluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower heads
  
• ragweed, ragwort, tansy ragwort, benweed, Senecio jacobaea go
  widespread European weed having yellow daisylike flowers
  
• groundsel, Senecio vulgaris go
  Eurasian weed with heads of small yellow flowers
  
• cocklebur, cockle-bur, cockleburr, cockle-burr go
  any coarse weed of the genus Xanthium having spiny burrs
  
• nettle go
  any of numerous plants having stinging hairs that cause skin irritation on contact (especially of the genus Urtica or family Urticaceae)
  
• tumbleweed go
  any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass
  
• wild parsnip, madnep go
  biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root