The Collaborative International Dictionary of English v.0.48:

Ribbonwood \Rib"bon*wood`\, n. (Bot.)
   A malvaceous tree (Hoheria populnea) of New Zealand, the
   bark of which is used for cordage.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ribbonwood
    n 1: deciduous New Zealand tree whose inner bark yields a strong
         fiber that resembles flax and is called New Zealand cotton
         [syn: ribbon tree, ribbonwood, Plagianthus regius,
         Plagianthus betulinus]
    2: small tree or shrub of New Zealand having a profusion of
       axillary clusters of honey-scented paper-white flowers and
       whose bark is used for cordage [syn: lacebark,
       ribbonwood, houhere, Hoheria populnea]