About.com has a pretty thorough poison list at
http://dogs.about.com/cs/disableddogs/f/faq_poisonlist.htm.
Here are the plants from it, with symptoms:
Trees and Vines Apple (stem and leaves) shock, mouth inflammation, rapid increase in breathing
Yew (American, English, Western) Diarrhea, vomiting, abdominal pain
Apricot Diarrhea, vomiting, abdominal pain
Almond Diarrhea, vomiting, abdominal pain
Peach Diarrhea, vomiting, abdominal pain
Wild Cherry Diarrhea, vomiting, abdominal pain
Japanese Plum Diarrhea, vomiting, abdominal pain
Ficus(Cuban Laurel) stomach upset
Cherry rapid breathing, shock, mouth inflammation, heart rate increase
Balsam Pear Diarrhea, vomiting, abdominal pain
Ficus Lyrata (Fiddle-Leaf) stomach upset, irritated skin
Oak Varied effects
Philodendron (Devil's Ivy) upset stomach, convulsions, asphyxiation, death
English Ivy stomach upset, hyperactivity, laboured breath, drooling, Fever, thirst increase, pupil dilation, staggering
Jasmine convulsions, death
Vine pupil dilation, upset stomach, drooling, heart failure
Matrimony Vine varied effects
Virginia Creeper varied effects
Houseplants Asparagus Fern vomiting, respiratory problems, kidney failure, tremours, abdominal pain
Caladium mouth irritation, stomach upset, asphyxiation, tremours, seizures, death
Colocasia (Elephant's Ear) mouth irritation, stomach upset, asphyxiation, tremours, seizures, death
Deiffenbachia (Dumb Cane) mouth irritation, stomach upset, asphyxiation, tremours, seizures, death
Philodendron (Saddle Leaf, Split Leaf) Mouth swelling, irritation
Poinsetta mouth irritation, stomach upset
Mum (Pot and Spider) Skin irritation
Umbrella Plant vomiting, respiratory problems, kidney failure, tremours, abdominal pain
Aloe Vera diarrhea
Mistletoe Varied effects
FlowersAmaryllis stomach upset, lethargy, shock, death
Crocus stomach upset, liver failure, lethargy, shock, death
Buttercup stomach upset
Calla Lily stomach upset, mouth irritation, asphyxiation, seizures, Death
Christmas Rose stomach upset, diarhea, convulsions
Chrysanthemum skin irritation
Daffodil (bulb) stomach upset, tremours, seizures, lethargy, heart Failure, Death
Easter Lily stomach upset, kidney failure
Foxglove stomach upset, tremours, seizures, lethargy, heart Failure, Death
Hyacinth (bulb) varied effects
Iris (root) stomach upset
Jessamine seizures, respiratory failure
Morning Glory stomach upset, hallucinations
Narcissus stomach upset, staggering, tremours, seizures, heart failure, death
Peony stomach upset, staggering, tremours, seizures, heart failure, death
Periwinkle hallucinogen
Poinsetta stomach upset, mouth irritation
Primrose stomach upset
Tulip (bulb) varied effects
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