The Collaborative International Dictionary of English v.0.48:

Indeciduous \In`de*cid"u*ous\, a.
   Not deciduous or falling, as the leaves of trees in autumn;
   lasting; evergreen; persistent; permanent; perennial.
   Opposite of deciduous.
   [1913 Webster]

         The indeciduous and unshaven locks of Apollo. --Sir T.
                                                  Browne.
   [1913 Webster]