The Collaborative International Dictionary of English v.0.48:

Spadiceous \Spa*di"ceous\, a. [L. spadix, -icis, a date-brown or
   nut-brown color. See Spadix.]
   1. Of a bright clear brown or chestnut color. --Sir T.
      Browne.
      [1913 Webster]

   2. (Bot.) Bearing flowers on a spadix; of the nature of a
      spadix.
      [1913 Webster]