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Last updated: 3/30/2006 4:05 PM CST

Please note that this list is of the 'well known' toxic plants. Toxic plants may not be limited to this list.

For any animal poison emergency please contact your vet immediately! You can also call the ASPCA's Animal Poison Control Center (APCC) at (888) 426-4435.
($50 consultation fee may apply)

All links open a Google image search so you have an idea what the plant looks like. I found this is more effective than to add the pictures here because there are so many varieties of plants.

A

Aloe'Aloe Vera'

Toxic attribute:

saponins

Can cause:

vomiting, depression, diarrhea, anorexia, tremors, change in urine color.

Amaryllis

Toxic attribute:

lycorine

Can cause:

vomiting, depression, diarrhea, abdominal pain, hyper salivation, anorexia, tremors.

Andromeda Japonica 'Pieris Japonica'

Toxic attribute:

grayanotoxin

Can cause:

vomiting, diarrhea, hyper salivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

Asian Lily 'Liliaceae'

Can cause in cats:

vomiting, in appetence, lethargy, and kidney failure.

Asparagus Fern 'Asparagus Sprengeri'

Can cause:

allergic dermatitis with repeated dermal exposure. Berry ingestion could result in gastric upset (vomiting, abdominal pain, or diarrhea).

Australian Nut 'Macadamia Integrifolia'

Can cause:

depression, hyperthermia, weakness, muscular stiffness, vomiting, tremors, increased heart rate. Only reported in dogs at this time.

Autumn Crocus 'Colchicum Autumnale'

Toxic attribute:

liliaceae

Can cause:

oral irritation, bloody vomiting, diarrhea, shock, multi-organ damage, bone marrow suppression.

Avocado 'Persea Americana'

Toxic attribute:

persin

Can cause:

vomiting, diarrhea, death, inflammation of mammary glands of rabbits, goats, cattle, and horses- Cardiac failure in goats- Respiratory distress, generalized congestion, fluid accumulation around the heart.

Azalea 'Rhododendron spp'

Toxic attribute:

grayanotoxin

Can cause:

vomiting, diarrhea, hyper salivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

B

Bird of Paradise 'Caesalpinia Gilliesii'

Can cause:

gastrointestinal disorders such as diarrhea, vomiting, in coordination is possible. Death in rabbits.

American Bittersweet 'Celastrus Scandens'

Can cause:

weakness, convulsions, gastroenteritis (vomiting, diarrhea).

European Bittersweet 'Solanum Dulcamara'

Toxic attribute:

solanine, saponins, atropine-like substances

Can cause:

drooling, in appetence, severe gastric upset, drowsiness, lethargy, weakness, dilated pupils, slow heart rate.

Branching Ivy 'Hedera Helix'

Toxic attribute:

(foliage is more toxic than the berries) hederagenin (a steroid saponic glycoside), triterpenoid saponins, falcardinol, didehydrofalcarinol.

Can cause:

gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Buckeye 'Aesculus spp'

Toxic attribute:

aesculin

Can cause:

severe gastroenteritis, depression or hyperexcitability, dilated pupils, coma.

Buddist Pine 'Podocarpus Macrophylla'

Can cause:

severe vomiting and diarrhea.

C

Caladium 'Caladium Hortulanum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Calla Lily 'Zantedeschia Aethiopica'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Castor Bean 'Ricinus Communis'

Toxic attribute:

ricin

Can cause:

(Beans are very toxic.) oral irritation, burning of mouth and throat, increase in thirst, vomiting, diarrhea, kidney failure, convulsions.

Ceriman / Cutleaf Philodendron 'Monstera Deliciosa'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Charming Diffenbachia 'Dieffenbachia Amoena'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Chinaberry Tree 'Melia Azedarach'

Toxic attribute:

tetranortriterpene-neurotoxins, unspecified gastroenteric toxin.

Can cause:

(Berries are most toxic) slow heartrate, diarrhea, vomiting, depression, weakness, seizures, and shock.

Chinese Evergreen 'Aglaonema Modestum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Christmas Rose 'Helleborus Niger'

Toxic attribute:

veratrin

Can cause:

abdominal pain, vomiting, bloody diarrhea, convulsions, delirium.

Clematis 'Clematis sp.'

Toxic attribute:

protoanemonin

Can cause:

vomiting, diarrhea, oral ulcers, ataxia irritant or vesicant action.

Cordatum 'Philodendron Oxycardium'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Corn Plant / Cornstalk Plant 'Dracaena Fragrans Massangean'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Cycads 'Cycad' 'Zamia'

Toxic attribute:

cycasin

Can cause:

vomiting, melena, icterus, increased thirst, hemorrhagic gastroenteritis, bruising, coagulopathy, liver damage, liver failure, death.

Cyclamen 'Cyclamen spp'

Can cause:

vomiting, gastrointestinal inflammation, and death.

D

Daffodil 'Narcissus spp'

Toxic attribute:

narcissine, narcipoeitin, lycorineh, other alkaloids.

Can cause:

severe gastrointestinal disorders, convulsions, shivering, hypotension, dermatitis, muscular tremors, and cardiac arrhythmias.

Day Lily 'Hemerocallis Dumortier'

Can cause:

vomiting, inappetence, lethargy, kidney failure. Cats are only species known to be affected.

Devil's Ivy 'Epipremnum Aureum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Dumb Cane 'Dieffenbachia spp'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

E

Easter Lily 'Lilium Longiflorum'

Can cause in cats:

vomiting, inappetence, lethargy, and kidney failure.

Elephant Ears 'Caladium Hortulanum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Emerald Feather / Emerald Fern 'Asparagus Densiflorus'

Can cause:

allergic dermatitis with repeated dermal exposure. Berry ingestion could result in gastric upset (vomiting, abdominal pain, or diarrhea).

English Ivy 'Hedera Helix'

Toxic attribute:

(The folliage is more toxic than the berrieshe) deragenin (a steroid saponic glycoside), triterpenoid saponins, and falcardinol and didehydrofalcarinol

Can cause:

gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

F

Fiddle-Leaf Philodendron 'Philodendron Bipennifolium'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Flamingo Plant 'Anthurium sp'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Florida Beauty 'Dracaena spp'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heart rate and drooling.

In both cats and dogs:

vomiting, depression, in appetence, drooling, in coordination, and weakness.

Foxglove 'Digitalis Purpurea'

Toxic attribute:

cardiac Glycosides

Can cause:

Cardiac arrhythmias, vomiting, diarrhea, weakness, cardiac failure, death.

Fruit Salad Plant 'Philodendron Pertusum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

G

Glacier Ivy 'Hedera Helix'

Toxic attribute:

hederagenin (a steroid saponic glycoside), triterpenoid saponins, and falcardinol and didehydrofalcarinol. The folliage is more toxic than the berries.

Can cause:

gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Gladiolas

Can cause:

vomiting, occasionally with blood, depression, diarrhea, occasionally with blood, hypersalivation, abdominal pain.

Glory Lily 'Gloriosa Superba'

Toxic attribute:

colchicine related alkaloids

Can cause:

oral irritation, bloody vomiting, diarrhea, shock, kidney and liver damage, bone marrow suppression.

Gold Dieffenbachia 'Dieffenbachia Picta'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Gold Dust Dracaena 'Dracaena Godseffiana'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Golden Pothos 'Epipremnum Aureum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Grapes / Raisins

Can cause in dogs:

vomiting, anorexia, diarrhea, Hypercalcemia (elevated blood calcium levels), elevated levels of blood urea nitrogen, creatinine, and phosphorous (substances that reflect kidney function), kidney damage or failure, stop urinating, and death.

Green Gold Nephthysis 'Syngonium Podophyllum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

H

Hahn's self branching English Ivy 'Hedera Helix'

Toxic attribute:

hederagenin (a steroid saponic glycoside), triterpenoid saponins, and falcardinol and didehydrofalcarinol.

Can cause:

(folliage is more toxic than the berries) gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Heartleaf Philodendron 'Philodendron Oxycardium'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Heavenly Bamboo 'Nandina Domestica'

Toxic attribute:

cyanogenic glycosides

Can cause:

cyanosis, pale mucous membranes, slow heartrate, vomiting, diarrhea, respiratory congestion, seizures, semi-coma, respiratory failure, death.

Holly 'Ilex spp'

Toxic attribute:

Saponins

Can cause:

intense vomiting and diarrhea, depression.

Horsehead Philodendron 'Philodendron Bipennifolium'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Hurricane Plant 'Monstera Deliciosa'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Hyacinth 'Hyacinthus orientalis'

Toxic attribute:

possibly narcissus-like alkaloids

Can cause:

intense vomiting, diarrhea, occassionally with blood, depression and tremors.

Hydrangea 'Hydrangea macrophylla'

Toxic attribute:

cyanogenic glycoside

Can cause:

vomiting, depression, anorexia, diarrhea, increase in heartrate, increase in body temperature.

I

Iris 'Iris sp.'

Can cause:

vomiting, occasionally with blood, depression, diarrhea, occasionally with blood, hypersalivation, abdominal pain.

J

Japanese Show Lily 'Lilium sp.'

Can cause in cats only:

vomiting, inappetence, lethargy, kidney failure.

Jerusalem Cherry 'Solanum Pseudocapsicum'

Toxic attribute:

solanine

Can cause:

gastrointestinal disturbances, possible ulceration of the gastrointestinal system, seizures, depression, respiratory depression, and shock.

K

Kalanchoe 'Kalanchoe spp'

Toxic attribute:

Bufodienalides

Can cause:

vomiting, diarrhea, bufodienalides are cardiotoxic.

L

Lace Fern 'Asparagus Setaceus'

Can cause:

allergic dermatitis with repeated dermal exposure. Berry ingestion could result in gastric upset (vomiting, abdominal pain, or diarrhea).

Lacy Tree 'Philodendron Selloum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Lily of the Valley 'Convallaria Majalis'
(There are many kinds of lilys that can cause many different problems. If this is not the lily you are looking for please search the rest of the page)

Toxic attribute:

cardiac glycosides, convallarin, convallatoxin

Can cause:

ataxia, vomiting, cardiac arrhythmias, death.

M

Macadamia Nut 'Macadamia Integrifolia'

Can cause in dogs:

depression, hyperthermia, weakness, muscular stiffness, vomiting, tremors, increased heartrate.

Madagascar Dragon Tree 'Dracaena Marginata'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Marble Queen 'Scindapsus Aureus'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Marijuana 'Cannabis Sativa'

Toxic attribute:

THC- tetrahydrocannabinal

Can cause:

Prolonged CNS depression, respiratory depression, weakness, ataxia, sedation, sometimes hyperexcitation.

Mexican Breadfruit 'Monstera Deliciosa'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Mistletoe (American) 'Phoradendron spp'

Toxic attribute:

toxalbumin, pharatoxin viscumin

Can cause:

gastrointestinal disorders, cardiovascular collapse, dyspnea, bradycardia, erratic behavior, (hallucinogenic in humans).

Morning Glory 'Ipomoea spp'

Toxic attribute:

lysergic acid

Can cause:

(seeds are toxic) hallucination, may cause diarrhea.

Mother-in-Law 'Monstera Deliciosa'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

N

Narcissus 'Narcissus spp'

Toxic attribute:

narcissine, narcipoeitin, lycorineh, other alkaloids

Can cause:

severe gastrointestinal disorders, convulsions, shivering, hypotension, dermatitis, muscular tremors, and cardiac arrhythmias.

Needlepoint Ivy 'Hedera Helix'

Toxic attribute:

(folliage is more toxic than the berries) hederagenin (a steroid saponic glycoside), triterpenoid saponins, falcardinol, didehydrofalcarinol.

Can cause:

gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Nephthytis 'Syngonium Podophyllum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Nightshade / Deadly Nightshade / Black Nightshade / Silverleaf Nightshade 'Solanum spp'

Toxic attribute:

solanine, saponins, atropine like substances

Can cause:

hyper salivation, inappetence, severe gastrointestinal upset, diarrhea, drowsiness, CNS depression, confusion, behavioral change, weakness, dilated pupils, slow heart rate.

O

Oleander 'Nerium Oleander'

Toxic attribute:

glycosides, nerioside, oleandroside, oleandrin

Can cause:

vomiting, diarrhea, cardiac abnormalities, decreased body temperature, death.

Onion 'Allium spp'

Toxic attribute:

N-propyldisulfide

Can cause:

(cats are more sensitive) gastrointestinal upset, hemolytic anemia, heinz body anemia, hemoglobinuria.

Orange Day Lily 'Hemerocallis Graminea'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

P

Panda 'Philodendron Panduraeforme'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Peace Lily / Maana Loa Peace Lily 'Spathiphyllum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Philodendron Pertusum 'Philodendron spp'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Plumosa Fern 'Asparagus Plumosus'

Can cause:

allergic dermatitis with repeated dermal exposure. Berry ingestion could result in gastric upset (vomiting, abdominal pain, or diarrhea).

Precatory Bean 'Abrus Precatorius'

Toxic attribute:

abrin (toxalbumin) and abric acid (glycoside)

Can cause:

(beans are very toxic, especially if broken or chewed) severe vomiting, diarrhea, increased body temperature, incoordination, inappetence, and death.

Q

Queensland Nut 'Macadamia Integrifolia'

Can cause in dogs:

depression, hyperthermia, weakness, muscular stiffness, vomiting, tremors, increased heartrate.

R

Red Emerald 'Philodendron'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Red Lily 'Lilium Umbellatum'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

Red-Margined Dracaena / Straight-Margined Dracaena 'Dracaena Marginata'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Red Princess 'Philodendron'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Rhododendron 'Rhododendron spp'

Toxic attribute:

grayantoxin

Can cause:

vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

Ribbon Plant 'Dracaena Sanderiana'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Rubrum Lily 'Lilium spp'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

S

Saddle Leaf Philodendron 'Philodendron Selloum'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Sago Palm 'Cycas' and 'Zamia' species

Toxic attribute:

cycasin

Can cause:

vomiting, melena, icterus, increased thirst, hemorrhagic gastroenteritis, bruising, coagulopathy, liver damage, liver failure, death.

Satin Pothos 'Scindapsus'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Schefflera 'Brassaia Actinophylla'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Spotted Dumb Cane 'Dieffenbachia Picta'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Stargazer Lily 'Lilium Orientalis'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

Striped Dracaena 'Dracaena Deremensis'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Sweetheart Ivy 'Hedera Helix'

Toxic attribute:

(foliage is more toxic than the berries) hederagenin (a steroid saponic glycoside), triterpenoid saponins, and falcardinol and didehydrofalcarinol.

Can cause:

gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Swiss Cheese Plant 'Monstera Deliciosa'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

T

Taro Vine 'Scindapsus Aureus'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Tiger Lily 'Lilium Tigrinum'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

Tomato Plant 'Lycopersicon spp'

Toxic attribute:

Solanine

Can cause:

hypersalivation, inappetence, severe gastrointestinal upset, diarrhea, drowsiness, CNS depression, confusion, behavioral change, weakness, dilated pupils, slow heart rate.

Tree Philodendron

Can cause:

Parts of plant are poisonous if ingested. Handling plant may cause skin irritation.

Tropic Snow Dumbcane 'Dieffenbachia Amoena'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Tulip

Can cause:

intense vomiting, depression, diarrhea, hypersalivation, inappetence.

V

Variable Dieffenbachia 'Dieffenbachia Picta'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing

Variegated Philodendron 'Scindapsus' 'Philodendron spp'

Toxic attribute:

calcium oxalate crystals

Can cause:

oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

W

Warneckei Dracaena 'Dracaena Deremensis'

Can cause in cats:

dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling.

Can cause in both cats and dogs:

vomiting, depression, inappetence, drooling, incoordination, and weakness.

Wood Lily 'Lilium umbellatum'

Can cause in cats:

vomiting, inappetence, lethargy, kidney failure.

Y

Yesterday, Today, Tomorrow 'Brunfelsia Australis'

Can cause:

depression, vomiting, diarrhea, muscle tremors, convulsions, increase urinations, incoordination, hyperthermia.

Yew / Japanese Yew 'Taxus'

Toxic attribute:

taxine A and B

Can cause:

sudden death from acute cardiac failure, early signs- muscular tremors, dyspnea, seizures in dogs.

Yucca 'Yucca sp'

Can cause:

vomiting, depression, diarrhea, drooling, seizures

Sources:
Some from ASPCA (who has a lot of misspellings and they have not updated in a while. But they are a great site anyway!)
Some from many hours of research in various spots of the WWW
Also, Google image search

Toxic Plants

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