The Collaborative International Dictionary of English v.0.48:

Liverwort \Liv"er*wort`\, n. (Bot.)
   1. A ranunculaceous plant (Anemone Hepatica) with pretty
      white or bluish flowers and a three-lobed leaf; -- called
      also squirrel cups.
      [1913 Webster]

   2. A flowerless plant (Marchantia polymorpha), having an
      irregularly lobed, spreading, and forking frond.
      [1913 Webster]

   Note: From this plant many others of the same order
         (Hepatic[ae]) have been vaguely called liverworts,
         esp. those of the tribe Marchantiace[ae]. See Illust.
         of Hepatica.
         [1913 Webster]