Bad Plant!

 

CalVet UPenn toxic plants pages (link)
an excellent source for photos and descriptions of common toxic plants in the Northeast

This list has been compiled from various online sources.  All sources carry disclaimer that Just because something is on the poisonous plants list doesn't mean it's fatal, and just because it is absent from the list doesn't mean it is safe!  Many cause merely gastric distress, some kill within an hour. 

list with photos

Aloe
Amaryllis
Andromeda Japonica
Asparagus Fern
Australian Nut
Autumn Crocus
Avocado

Bird of Paradise
American Bittersweet
European Bittersweet
Branching Ivy
Buckeye
Buddist Pine

Caladium
Calla Lily
Castor Bean
Ceriman (aka Cutleaf Philodendron)
Charming Diffenbachia
Chinaberry Tree
Chinese Evergreen
Christmas Rose
Clematis
Cordatum
Cornstalk Plant (aka Corn Plant)
Cutleaf Philodendron (aka Ceriman)
Cycads

Day Lily
Devilís Ivy
Dumb Cane
Deadly Nightshade

Elephant Ears
Emerald Feather
Emerald Fern
English Ivy

Fiddle-Leaf Philodendron
Flamingo Plant
Florida Beauty
Foxglove
Fruit Salad Plant

Glacier Ivy
Gladiolas
Glory Lily
Gold Dieffenbachia
Gold Dust Dracaena
Golden Pothos
Green Gold Nephthysis

Hahnís self branching English Ivy
Heartleaf Philodendron
Heavenly Bamboo
Holly
Hops
Horsehead Philodendron
Hurricane Plant
Hydrangea

Iris


Japanese Show Lily
Japanese Yew
Jerusalem Cherry

Kalanchoe

Lace Fern
Lacy Tree

Macadamia Nut
Madagascar Dragon Tree
Marble Queen
Marijuana
Mauna Loa Peace Lily (aka Peace Lily)
Mexican Breadfruit
Mistletoe "American"
Morning Glory
Mother-in-Law

Narcissus
Needlepoint Ivy
Nephthytis
Nightshade
Oleander
Onion

Panda
Peace Lily
Plumosa Fern
Precatory Bean

Queensland Nut
Red Emerald
Red Lily
Red Princess
Rhododendron
Ribbon Plant
Rubrum Lily
Sago Palm
Satin Pothos
Schefflera
Spotted Dumb Cane
Stargazer Lily
Striped Dracaena
Sweetheart Ivy
Swiss Cheese Plant
Taro Vine
Tiger Lily
Tomato Plant
Tree Philodendron
Tropic Snow Dumbcane
Tulip

Variegated Philodendron

Warneckei Dracaena
Wood Lily

Yesterday, Today, Tomorrow
Yew (aka Japanese Yew)
Yucca

PetMD list of pet friendly plants

 

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Further exposition on some more common or more dangerous plants:

    Aloe
Common Name:
Aloe
Scientific Name: Aloe vera
Family: Liliaceae
Toxic Principle: saponins
Clinical signs: vomiting, depression, diarrhea, anorexia, tremors, change in urine color.

    Amaryllis
Common Name:
Amaryllis
Scientific Name: Amaryllis sp.
Family: Amaryllidaceae
Toxic Principle: Lycorine and others
Clinical signs: vomiting, depression, diarrhea, abdominal pain, hypersalivation, anorexia, tremors.

    Asian Lily (Liliaceae)
Common Name: Asian Lily (Liliaceae)
Scientific Name: Lilium asiatica
Family: Ericaceae
Toxic Principle: unknown
Clinical signs: vomiting, inappetence, lethargy, kidney failure, and death is possible. Cats are only species known to be affected.

     Asparagus Fern
Common Name: Asparagus Fern
Scientific Name: Asparagus sprengeri
Family: Liliaceae
Toxic Principle: not available
Clinical signs: allergic dermatitis with repeated dermal exposure. Berry ingestion could result in gastric upset (vomiting, abdominal pain, or diarrhea.)

     Autumn Crocus
Common Name:
Autumn Crocus
Scientific Name: Colchicum autumnale
Family: Liliaceae
Toxic Principle: colchicine and other alkaloids
Clinical signs: oral irritation, bloody vomiting, diarrhea, shock, multi-organ damage, bone marrow suppression.

    Azalea
Common Name:
Azalea
Scientific Name: Rhododendron spp
Family: Ericaceae
Toxic Principle: grayantoxin
Clinical signs: vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

    Cyclamen
Common Name:
Cyclamen
Sowbread
Scientific Name: Cyclamen spp
Family: Primulaceae
Toxic Principle: Terpenoid saponins
Clinical signs: Salivation, vomiting, diarrhea
    Large ingestions of tubers: heart rhythm abnormalities, seizures, death

    Daffodil
Common Name:
Daffodil
Scientific Name: Narcissus spp
Family: Amaryllidaceae
Toxic Principle: narcissine, narcipoeitin, lycorineh, other alkaloids.
Clinical signs: severe gastrointestinal disorders, convulsions, shivering, hypotension, dermatitis, muscular tremors, and cardiac arrhythmias.

    Day Lily
Common Name:
Day Lily
Scientific Name: Hemerocallis spp.
Family: Liliaceae
Toxic Principle: unknown
Clinical signs:
Cats: kidney failure
Cows: Incoordination, paresis, blindness, death

     Easter Lily
Common Name:
Easter Lily
Scientific Name: Lilium longiflorum
Family: Liliaceae
Toxic Principle: unknown
Clinical signs: vomiting, inappetence, lethargy, kidney failure, and death is possible. Cats are only species known to be affected.

    Gladiolas

Common Name:
Gladiolas
Scientific Name: Gladiolas species
Family: Iridaceae
Toxic Principle: not available
Clinical signs: vomiting, occasionally with blood, depression, diarrhea, occasionally with blood, hypersalivation, abdominal pain.

     Hyacinth
Common Name:
Hyacinth
Scientific Name: Hyacinthus oreintalis
Family: Liliaceae
Toxic Principle: possibly narcissus-like alkaloids
Clinical signs: intense vomiting, diarrhea, occassionally with blood, depression and tremors.

     Hydrangea
Common Name:
Hydrangea
Scientific Name: Hydrangea macrophylla
Family: Saxifragaceae
Toxic Principle: cyanogenic glycoside
Clinical signs: vomiting, depression, anorexia, diarrhea, increase in heartrate, increase in body temperature.

    Heavenly Bamboo
Common Name:
Heavenly Bamboo
Scientific Name: Nandina domestica
Family: Berberidaceae
Toxic Principle: cyanogenic glycosides
Clinical signs: cyanosis, pale mucous membranes, slow heartrate, vomiting, diarrhea, respiratory congestion, seizures, semi-coma, respiratory failure, death.

    Japanese Yew (aka Yew)
Common Name: Japanese Yew (aka Yew)
Scientific Name: Taxus sp.
Family: Taxaceae
Toxic Principle: taxine
Clinical signs: sudden death from acute cardiac failure, early signs- muscular tremors, dyspnea, seizures in dogs.

    Lily of the Valley
Common Name: Lily of the Valley
Scientific Name: Convalaria majalis
Family: Liliaceae
Toxic Principle: cardiac glycosides, convallarin, convallatoxin
Clinical signs: ataxia, vomiting, cardiac arrhythmias, death.

    Oleander
Common Name: Oleander
Scientific Name: Nerium oleander
Family: Apocynaceae
Toxic Principle: cardiac glycosides, nerioside, oleandroside, oleandrin
Clinical signs: vomiting, diarrhea, cardiac abnormalities, decreased body temperature, death.

    Rhododendron
Common Name: Rhododendron
Scientific Name: Rhododendron spp
Family: Ericaceae
Toxic Principle: grayantoxin
Clinical signs: vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

    Yucca
Common Name: Yucca
Scientific Name: Yucca sp
Family: Agavaceae
Toxic Principle: Not available
Clinical signs: vomiting, depression, diarrhea, drooling, seizures.

 

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