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Poisonous Plants

Links are to Wikipedia 
Common NameBotanical Name
Aconite (wolfsbane, monkhood)Aconitum spp.
Anemone (windflower)Anemone spp.
AnthuriumAnthurium spp.
Atamasco lilyZephyranthes spp.
Autumn crocusColchicum autumnale
AzaleaAzalea spp. (Rhododendron spp.)
BaneberryActaea spp.
Black locustRobinia pseudoacacia
BloodrootSanguinaria canadensis
BoxwoodBuxus spp.
Burning bush (strawberry bush, spindle tree, wahoo)Euonymus spp.
ButtercupRanunculus spp.
Butterfly weedAsclepias spp.
CaladiumCaladium spp.
Calla (calla lily)Calla palustris (Zantedeschia aethiopica)
Carolina jasmine (yellow jessamine)Gelsemium sempervirens
Castor beanRicinus communis
Cherry laurelPrunus caroliniana
Chinaberry (bead tree)Melia azedarach
Christmas roseHelleborus niger
ClematisClematis spp.
DaffodilNarcissus spp.
Deadly nightshade (belladonna)Atropa belladona
Death cammas (black snakeroot)Zigadenus spp.
Delphinium (larkspur)Delphinium spp.
DogbaneApocynum spp.
DumbcaneDieffenbachia spp.
Elephant earsColocasia antiquorum
False helleboreVeratrum viride
Four o'clockMirabilis jalapa
FoxgloveDigitalis purpurea
Giant elephant earAlocasia spp.
Gloriosa lilyGloriosa superba
Golden chain tree (laburnum)Laburnum anagyroides
GoldensealHydrastis canadensis
Heavenly bamboo (nandina)Nandina domestica
Henbane (black henbane)Hyoscyamus niger
Horse chestnut (Ohio buckeye)Aesculus spp.
Horse nettleSolanum spp.
HyacinthHyacinthus orientalis
Hyacinth beanDolichos lablab
HydrangeaHydrangea spp.
IrisIris spp.
Ivy (English ivy)Hedera helix
Jack-in-the-pulpitArisaema triphyllum
Jerusalem cherrySolanum pseudocapsicum
Jessamine (jasmine)Cestrum spp.
Jetbead (jetberry)Rhodotypos tetrapetala
Jimson weedDatura spp. (Brugmansia spp.)
JonquilNarcissus spp.
Kentucky coffee treeGymnocladus dioica
LantanaLantana camara
Leopard's baneArnica montana
Lily of the valleyConvallaria majalis
Lobelia (cardinal flower, Indian tobacco)Lobelia spp.
Marsh marigoldCaltha palustris
May apple (mandrake)Podophyllum peltatum
Mescal bean (Texas mountain laurel, frijo lillo)Sophora secundiflora
MistletoePhoradendron spp.
Morning gloryIpomoea
Mountain laurelKalmia latifolia
NightshadeSolanum spp.
OleanderNerium oleander
Periwinkle (myrtle, vinca)Vinca spp.
PhilodendronPhilodendron spp. (Monstera spp.)
PittosporumPittosporum spp.
Poison hemlockConium maculatum
PotatoSolanum tuberosum
PrivetLigustrum spp.
RhododendronRhododendron spp.
Rock poppy (celandyne)Chelidonium majus
ScheffleraSchefflera spp.
Spring adonisAdonis vernalis
SpurgeEuphorbia spp.
Star of BethlehemOrnithogalum umbellatum
Sweet peaLathyrus spp.
TobaccoNicotiana tabacum
Trumpet flower (chalice vine)Solandra spp.
Water hemlockCicuta maculata
Wild cherry (black cherry)Prunus serotina
WisteriaWisteria spp.
Yellow allamandaAllamanda cathartica
Yellow oleander (tiger apple, be still tree, lucky nut)Thevetia peruviana
Yesterday-today-and-tomorrowBrunfelsia spp.