There is a good list in "The Baby Book" by Dr. Sears. Pointsettia actually is not all that dangerous. English ivy is poisonous.
You might be able to get a list by calling your regional poison control center, usually listed in the emergency numbers of your phone book.
The animals have to take their chances if they choose to nibble on the potted plants, a clearly illegal activity for my pets. I'm only worried about what the child might eat.