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Webster 1913 Edition

Noun.

Leaves, collectively; foliage.

Noun.

Abundance of leaves.

leafage ‎(countable and uncountable, plural leafages)

The leaves of plants collectively; foliage.
Color change in New England is the tourist time, when people come to see the leafage turn brilliant colors.
- 1932, Rudyard Kipling, They
  She came towards me, half feeling her way between the tree boles, and though a child, it seemed, clung to her skirt, it swerved into the leafage like a rabbit as she drew nearer.