From The Collaborative International Dictionary of English v.0.48:

Wardian \Ward"i*an\, a.
   Designating, or pertaining to, a kind of glass inclosure for
   keeping ferns, mosses, etc., or for transporting growing
   plants from a distance; as, a Wardian case of plants; -- so
   named from the inventor, Nathaniel B. Ward, an Englishman.
   [1913 Webster]
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