Yes, the entire cherry tree is considered toxic to horses because the tissues contain cyanide. The highest risk is in wilting and dying leaves, but the entire tree is toxic.
Known as the Irish Strawberry Tree it is moderately toxic to goats and toxic to most other animal species.
Wisconsin's State Tree: The Sugar Maple Tree
The sugar maple is the state tree of Wisconsin.
True weeping willows are not toxic to horses, but other varieties may be.
Horses can typically eat the bark of Sumac trees with no ill effects and it is not listed as being toxic. However it should be noted that if horses are allowed to strip bark off of trees it can and will kill the trees.
Cherry Laurel's are extremely toxic to horses, the leaves can cause cyanide poisoning.
Caffeine is uncontrollably more toxic to animals including dos, horses, and parrots.
There are many plants that are toxic to horses, too many to post here. For a good list of plants that are toxic (bad) for horses, visit the ASPCA website. Click the Animal Poison Control link and then go to the Toxic and Non-Toxic Plants. Click horses and you will be provided with a good listing of plants that are not good for horsers. Plus you can click on non-toxic and find what plants can be safely planted around areas where horses are being kept.
There is a tiny bit of cyanide in the seeds of horse. They are technically toxic to horses, but only if the horse eats enough of them to raise the level or cyanide in their body to toxic levels.
There are some palm trees which are toxic to burn. One of types of palm tree considered to be toxic is the sago palm tree.
Sugar Maple Tree is the Wisconsin State Tree.