Common Name:    Giant Dumbcane Scientific Name:   Dieffenbachia amoena Family:                  Araceae   Native to tropical America, this plant is one of the many Dieffenbachia species that are used widely as durable, coarse textured indoor plants.  The name "dumbcame" came from the fact that one can be painfully and temporarily speechless by chewing the leaves, which contain calcium oxalate crystals.  Keep root medium between waterings.  Propagated by cuttings, air-layering, or placing stem sections (canes) horizontally on the growing medium for rooting.