Arum hardyness & more questions

[Bonaventure W Magrys]

Anyone have any luck growing Arum creticum, cyrenaicium, dioscoroides, nigrum,
and purpureospathum in frost prone areas? I know italicum suffers no damage and
purpureospathum seems to be doing well now also. What is the status of
naturalized species in the Southwest?

Are there intermediate species to the genus Arisaema or any similar? Also how
close are tropical arisaemas to Amorphophallus?

Bonaventure W. Magrys
Elizabeth, NJ
USA zone 6