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1-20 of 20 possibilities

European grass naturalized as a weed in North America; sharp-pointed seeds cause injury when eaten by livestock Aegilops triuncalis , goat grass
European weed naturalized in America that resembles parsley but causes nausea and poisoning when eaten Aethusa cynapium , fool's parsley , lesser hemlock
European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed Agropyron repens , couch grass , dog grass , quack grass , quackgrass , quick grass , witch grass , witchgrass
European annual having large trumpet-shaped reddish-purple flowers and poisonous seed; a common weed in grainfields and beside roadways; naturalized in America Agrostemma githago , corn campion , corn cockle , crown-of-the-field
European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage alfilaria , alfileria , clocks , Erodium cicutarium , filaree , filaria , pin clover , pin grass , redstem storksbill
prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses alligator grass , alligator weed , Alternanthera philoxeroides
annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally Ambrosia artemisiifolia , common ragweed
European white-flowered weed naturalized in North America Anthemis arvensis , corn chamomile , corn mayweed , field chamomile
widespread rank-smelling weed having white-rayed flower heads with yellow discs Anthemis cotula , dog fennel , mayweed , stinking chamomile , stinking mayweed
coarse erect biennial Old World herb introduced as a weed in eastern North America Anthriscus sylvestris , cow parsley , wild chervil
intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits apple of Peru , common thorn apple , Datura stramonium , Jamestown weed , jimson weed , jimsonweed
small invasive self-pollinating weed with small white flowers; much studied by plant geneticists; the first higher plant whose complete genome sequence was described Arabidopsis thaliana , mouse-ear cress
silver-haired shrub of central and southern United States and Mexico; a troublesome weed on rangelands Artemisia filifolia , sand sage , silvery wormwood
tropical herb having orange-red flowers followed by pods suggesting a swallow with outspread wings; a weed throughout the tropics Asclepias curassavica , blood flower , swallowwort
coarse prickly weed having pale yellow flowers and yellow berrylike fruit; common throughout southern and eastern United States ball nettle , ball nightshade , bull nettle , horse nettle , Solanum carolinense
European annual grass often found as a weed in waste ground especially along roadsides and hedgerows barley grass , Hordeum murinum , wall barley
coarse annual panic grass; a cosmopolitan weed; occasionally used for hay or grazing barn grass , barn millet , barnyard grass , Echinochloa crusgalli
European weed having a winged stem and hairy leaves; adventive in the eastern United States Barnaby's thistle , Centaurea solstitialis , yellow star-thistle
tropical American annual weed with small radiate heads of white flowers; adventive in southern United States bastard feverfew , Parthenium hysterophorus
widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity benweed , ragweed , ragwort , Senecio jacobaea , tansy ragwort
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