Source : Webster's Revised Unabridged Dictionary (1913)

Luxuriance \Lux*u"ri*ance\, n. [Cf. F. luxuriance.]
   The state or quality of being luxuriant; rank, vigorous
   growth; excessive abundance produced by rank growth.
   ``Tropical luxuriance.'' --B. Taylor.

Source : WordNet®

luxuriance
     n : the property of being lush and abundant [syn: {lushness}]