The Collaborative International Dictionary of English v.0.48:

Spicate \Spi"cate\, Spicated \Spi"ca*ted\, a. [L. spicatus, p.
   p. of spicare furnish with spikes, or ears, fr. spica a
   spike, or ear.] (Bot.)
   Having the form of a spike, or ear; arranged in a spike or
   spikes. --Lee.
   [1913 Webster]