No, poinsettias are not poisonous.

Children's Hospital of Pittsburgh

Poinsettia plants are poison to children and pets-Fiction!

A study released in 2000 by Children's Hospital of Pittsburgh and Carnegie Mellon University found that out of nearly 23, 000 poinsettia exposures reported to poison control centers nationwide, there was essentially no toxicity of significance of any kind.

Snopes.com

snopes.com: Poisonous Poinsettias

Status:   False.

British Medical Journal

Festive medical myths -- Vreeman and Carroll 337 -- bmj.com

No one died from exposure to or ingestion of poinsettia, and most (96%) did not even require medical treatment.

Festive medical myths -- Vreeman and Carroll 337 -- bmj.com

Even though public health officials have reported that poinsettias are safe, many continue to believe this is a poisonous plant.16

Consumer Products Safety Commission

The Poisonous Poinsettia Myth

And in 1975 the Consumer Products Safety Commission cited lack of substantial evidence in its decision to deny a petition requiring warning labels for poinsettias.

American Veterinary Medicine Association

Poinsettia plants are poison to children and pets-Fiction!

 The American Veterinary Medicine Association of America (AVMA), doesn't include poinsettias on its list of plants that are a threat to animals.

ASPCA Animal Poison Center

Poinsettia plants are poison to children and pets-Fiction!

The ASPCA Animal Poison Center in Urbana, Illinois says it regards poinsettias as having such low toxicity risk that it doesn't even recommend decontaminating animals that may have ingested them. 

Guardian (UK newspaper)

Scientists debunk myth that most heat is lost through head | Science | The Guardian

The team went on to show that contrary to popular belief, the Christmas plant poinsettia with it blood-red leaves is not toxic, and that suicides do not rise over the holiday period

truthorfiction.com

Poinsettia plants are poison to children and pets-Fiction!

The consensus of government agencies, health centers, veterinary groups, and plant and flower organizations that we've surveyed, however, is that poinsettias are not toxic and do not pose a health threat to children or pets.

About.com

Are Poinsettias Poisonous?

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

urbanext.illinois.edu

Frequently Asked Questions - The Poinsettia Pages - University of Illinois Extension

Poinsettias are not poisonous.

landsteward.org

Poinsettias are non-toxic, despite the persistent myth!

Poinsettias are non-toxic, despite the persistent myth!

Poinsettias are non-toxic, despite the persistent myth!

reality: They're not.

rosefloral.com

The Poisonous Poinsettia Myth

Researchers at the Ohio State University, working in conjunction with the SAF, tested the effects of ingesting unusually high doses of the leaves, stems, and sap from the poinsettias and found the plant to be nontoxic.

The Poisonous Poinsettia Myth

Abundant evidence exists to debunk the myth, however.

American Society of Florists

Poinsettia plants are poison to children and pets-Fiction!

Their conclusion was that there was no toxicity or any other side effects even when the rats were given large doses.  

Yahoo!

Yahoo! Canada Answers - What would happen if a dog ate a poinsettia?

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

Yahoo Answers

My cat ate a Poinsettia will she die? - Yahoo! Answers

reality: They're not.

What would happen if a dog ate a poinsettia? - Yahoo! Answers

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

Are poinsettias toxic for dogs? - Yahoo! Answers

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

myseniorsite.ca

Poinsettia facts, history and care tips - mySeniorSite

Poinsettias are not poisonous.

2poinsettia.blogspot.com

poinsettia: November 2009 - poinsettia

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

poinsettia: What would happen if a dog ate a poinsettia?

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

mayfieldflorist.blogspot.com

mayfieldflorist.blogspot.com

However poinsettias have undergone extensive testing and there is no evidence that they are toxic or unsafe to have in the house.

royalpalmnurseries.com

Royal Palm Nurseries

Poinsettias are not poisonous.

rosefarm2.blogspot.com

rosefarm2.blogspot.com

Poinsettias are not poisonous.

Yes, poinsettias are poisonous.

houseplantsforyou.com

Some Houseplants Are Poisonous To Your Pet | House Plant Care And Information

Poinsettias Are Poisonous

Some Houseplants Are Poisonous To Your Pet | House Plant Care And Information

Poinsettia’s are popular plants at Christmas, but they can cause cramps and diarrhea and if the sap gets into your dogs eyes, it can even cause blindness.

Some Houseplants Are Poisonous To Your Pet | House Plant Care And Information

Poinsettia’s are popular plants at Christmas, but they can cause cramps and diarrhea and if the sap gets into your dogs eyes, it can even cause blindness.