Aloe

Common Name: Aloe
Clinical signs: vomiting, depression, diarrhea, anorexia, tremors, change in urine color.

Amaryllis

Common Name: Amaryllis
Clinical signs: vomiting, depression, diarrhea, abdominal pain, hypersalivation, anorexia, tremors.

Asian Lily (Liliaceae)
 

Common Name: Asian Lily (Liliaceae)
Clinical signs: vomiting, inappetence, lethargy, and kidney failure. Cats are only species known to be affected.

Asparagus Fern

Common Name: Asparagus Fern
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
Clinical signs: oral irritation, bloody vomiting, diarrhea, shock, multi-organ damage, bone marrow suppression.

Avocado - Tree, fruit and pit

Common Name: Avocado
Clinical signs: 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

Common Name: Azalea
Clinical signs: vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, CNS depression, cardiovascular collapse and death.

Branching Ivy

Common Name: Branching Ivy; the foliage is more toxic than the berries.
Clinical signs: gastrointestinal upset, diarrhea, hyperactivity, breathing difficulty, coma, fever, polydipsia, dilated pupils, muscular weakness, and incoordination.

Buckeye

Common Name: Buckeye
Clinical signs: severe gastroenteritis, depression or hyperexcitability, dilated pupils, coma

Calla Lily

Common Name: Calla Lily
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Castor Bean

Common Name: Castor Bean
Clinical signs: Beans are very toxic: oral irritation, burning of mouth and throat, increase in thirst, vomiting, diarrhea, kidney failure, convulsions.

Ceriman (aka Cutleaf Philodendron)

Common Name: Ceriman (aka Cutleaf Philodendron)
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Charming Diffenbachia

Common Name: Charming Diffenbachia
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Chinaberry Tree

Common Name: Chinaberry Tree
Clinical signs: Berries are most toxic. Can see slow heartrate, diarrhea, vomiting, depression, weakness, seizures, and shock.

Common Name: Chinese Evergreen
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Christmas Rose

Common Name: Christmas Rose
Clinical signs: abdominal pain, vomiting, bloody diarrhea, convulsions, delirium.

Clematis

Common Name: Clematis
Clinical signs: vomiting, diarrhea, oral ulcers, ataxia irritant or vesicant action.

Corn Plant (aka Cornstalk Plant)

Common Name: Corn Plant (aka Cornstalk Plant)
Clinical signs: In cats: dilated pupils, breathing difficulty, abdominal pain, increased heartrate and drooling. In both cats and dogs: vomiting, depression, inappetence, drooling, incoordination, and weakness.

Cyclamen

Common Name: Cyclamen
Clinical signs: vomiting, gastrointestinal inflammation, and death.

Daffodil

Common Name: Daffodil
Clinical signs: severe gastrointestinal disorders, convulsions, shivering, hypotension, dermatitis, muscular tremors, and cardiac arrhythmias.

Day Lily

Common Name: Day Lily
Clinical signs: vomiting, inappetence, lethargy, kidney failure. Cats are only species known to be affected.

Common Name: Devil's Ivy
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Dumb Cane or Dieffenbachia

Common Name: Dumb Cane or Dieffenbachia
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.

Deadly Nightshade

Common Name: Nightshade (includes several varieties, the most common being Deadly Nightshade, Black Nightshade, and Silverleaf Nightshade)
Clinical signs: hypersalivation, inappetence, severe gastrointestinal upset, diarrhea, drowsiness, CNS depression, confusion, behavioral change, weakness, dilated pupils, slow heart rate.

Elephant Ears

Common Name: Elephant Ears
Clinical signs: oral irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty in swallowing.