Tim thinks they are a type of Angel's Trumpet but I don't think so.I think it is a tropical Trumpet Plant....I was right I just checked.Solandra maxima, Solandra hartwegii, Solandra seleraeHere's the linkhttp://toptropicals.com/catalog/uid/SOLANDRA_MAXIMA.htm
Ah Ha! Thanks, mystery solved! Well they are a very peculiar and (forgive me, ugly) plant and I don't think I'll be turning my back on them, just to be on the safe side!
Apparently they do have a tendancy to take over, so I wouldn't turn my back on them!Oh and they can cause hallucinations! (But I think you have to prepare them in a special way.) I don't think that they will just cause hallucinations just by getting too close or from pollen as tim is starting to be concerned about - just don't eat them!