Dioon spinulosum
COMMON NAME  | Giant dioon, or Gum
  palm  | 
TYPE  | Cycad  | 
FAMILY  | Zamiaceae  | 
NOTES  | The giant dioon is
  the largest of the American cycads and is known to grow up to 50 ft high in
  the wild. The species name of spinulosum is derived from the Latin, meaning
  spiny or thorny in reference to the fronds.  | 
GEOGRAPHIC REGION  | Veracruz and Oaxaca, Mexico  | 
NATIVE HABITAT  | Found on limestone
  cliffs and rocky hillsides 1000 ft above sea level.  | 
WEB SOURCES  |