Euonymus sp. If the outside part is warty (not clear from you pic) it is E. americanus.See.... http://www.floridata.com/wallpaper/jpg/Euonymus_americanus800.jpg
i'm pretty sure thats it. we have lived here since the late 70's and i have never seen such a plant here. i raise horses and i need to know if they are toxic to horses. any help would be greatly appreciated. thanks
Seeds are a strong laxative. Fruit is toxic and can cause coma in sufficient quantity. I'd say keep the horses away from it!