What should an iguana's main diet be?

Yucca root, watercress, snap peas, parsnips, papaya, okra, mustard greens, kamabocha squash, dandelion greens,collard greens, chicory greens, cactus leaf, ernut squash,alfalfa, and acorn squash or all main foods of the iguana, for iguana treats and snacks go to www.greenigsociety.org/foodchart.htm.