Many households contain plants and flowers that may actually do harm, or be fatal, to your family pets.
The US animal welfare organisation ASPCA runs a national poisons control centre for pets which includes a list of the most frequently encountered plants that have been reported as having systemic effects on pets and/or intense effects on the gastrointestinal tract. The link to the list is:
http://www.aspca.org/site/PageServer?pagename=pro_apcc_toxicplants
WARNING: A special warning must be made regarding lily toxicity in cats. Lily toxicity is an extremely devestating toxicity which, despite the best treatment from vets, causes many cats to die. Asian, Day, Easter, Glory, Japanese Show, Peace, Red, Rubrum, Stargaszer, Tiger and Wood lilies are all toxic to cats. Even ingesting the smallest part of any of the lily plant may cause intoxication and death. Signs of ingestion and poisoning include lathargy, depression and vomiting. If untreated, acute kidney or renal failure may occur. If you suspect that your cat may have injested part of a lily and is showing signs of lily toxicity, please visit your Vet or Animal Emergency Hospital immediately.
The following plants have also been found to be dangerous for pets:
Aloe
Aloe vera
Amaryllis
American Bittersweet
Andromeda Japonica
Asian Lily (Liliaceae)
Asparagus Fern
Australian Nut
Autumn Crocus
Avocado
Azalea
Bird of Paradise
Boston ivy
Branching Ivy
Buckeye
Buddist Pine
Caladium
Caladium
Calla Lily
Castor Bean
Ceriman (Cutleaf Philodendron)
Charming Diffenbachia
Chinaberry Tree
Chinese Evergreen
Christmas Rose
Clematis
Cordatum
Corn Plant (Cornstalk Plant)
Cornstalk Plant (Corn Plant)
Cutleaf Philodendron (Ceriman)
Cycads
Cyclamen
Daffodil
Day Lily
Deadly Nightshade
Devil's Ivy
Dumb Cane
Dumbcane
Easter Lily
Elephant Ears
Emerald Feather (Emerald Fern)
Emerald Fern (Emerald Feather)
English ivy
English Ivy
European Bittersweet
Fiddle-Leaf Philodendron
Flamingo Plant
Florida Beauty
Foxglove
Fruit Salad Plant
German ivy
Glacier Ivy
Gladiolas
Glory Lily
Gold Dieffenbachia
Gold Dust Dracaena
Golden Pothos
Green Gold Nephthysis
Hahn's self branching English Ivy
Heartleaf Philodendron
Heavenly Bamboo
Holly
Horsehead Philodendron
Hurricane Plant
Hyacinth
Hydrangea
India rubber plant
Iris
Japanese Show Lily
Japanese Yew (Yew)
Jerusalem Cherry
Kalanchoe
Lace Fern
Lacy Tree
Lily of the Valley
Macadamia Nut
Madagascar Dragon Tree
Marble Queen
Marijuana
Mauna Loa Peace Lily (Peace Lily)
Mexican Breadfruit
Mistletoe
Mistletoe "American"
Morning Glory
Mother-in-Law
Narcissus
Needlepoint Ivy
Nephthytis
Nightshade
Oleander
Onion
Orange Day Lily
Panda
Peace Lily (Maana Loa Peace Lily)
Philodendron
Philodendron Pertusum
Plumosa Fern
Potted chrysanthemum
Precatory Bean
Queensland Nut
Red Emerald
Red Lily
Red Princess
Red-Margined Dracaena (aka Straight-Margined Dracaena)
Rhododendron
Ribbon Plant (Dracaena sanderiana)
Rubrum Lily
Saddle Leaf Philodendron
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
Variable Dieffenbachia
Variegated Philodendron
Warneckei Dracaena
Weeping fig
Wood Lily
Yew
Yucca
The following plants and shrubs have been known to poison livestock:
Monterey Cypress
Rhododendrons
Yew Taxux accata
Nerium oleander cvs
Azaleas.