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Webster 1913 Edition

Noun.

[Cf. F.

luxuriance

The state or quality of being luxuriant; rank, vigorous growth; excessive abundance produced by rank growth.

“Tropical luxuriance.”

B. Taylor.

luxuriance ‎(countable and uncountable, plural luxuriances)

The property of being luxuriant.
- 1949 - Bruce Kiskaddon, George R. Stewart Earth Abides
  Yet such was the luxuriance of the tropical growth that the rats had not attained such numbers as to provide competition among members of the species.