The Collaborative International Dictionary of English v.0.48:

Gemmation \Gem*ma"tion\, n. [Cf. F. gemmation.]
   [1913 Webster]
   1. (Biol.) The formation of a new individual, either animal
      or vegetable, by a process of budding; an asexual method
      of reproduction; gemmulation; gemmiparity. See Budding.
      [1913 Webster]

   2. (Bot.) The arrangement of buds on the stalk; also, of
      leaves in the bud.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gemmation
    n 1: asexual reproduction in which a local growth on the surface
         or in the body of the parent becomes a separate individual
         [syn: pullulation, gemmation]