Dieffenbachia longispatha
Dieffenbachia longispatha is a species of flowering plant in the family Araceae, native to Panama and Colombia. A large member of its genus, reaching , it is pollinated by scarab beetles from the genera Cyclocephala and Erioscelis. References

longispatha
Flora of Panama
Flora of Colombia
Plants described in 1915 
Taxa named by Adolf Engler
Taxa named by Kurt Krause