Are there any spiny looking green seed pods, with grayish speckled elongated seeds?  It looks like a castor bean plant.  It is highly toxic if it is!  The seeds contain RICIN!!!!!  I don't know what they do to make the castor oil from it, without including the ricin with it.  But if it is a greyish green looking plant, it could be that.  It is an invasive plant.  The seeds, may be brownish, I haven't seen any in a while.  Every now and then I will see some on the side of the road.
                                           Wayne