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From: WordNet (r) 2.0

 Gymnospermophyta
      n : plants having naked seeds not enclosed in an ovary; in some
          systems considered a class (Gymnospermae) and in others a
          division (Gymnospermophyta); comprises three subdivisions
          (or classes): Cycadophytina (class Cycadopsida) and
          Gnetophytina (class Gnetopsida) and Coniferophytina
          (class Coniferopsida); in some classifications the
          Coniferophytina are divided into three groups:
          Pinophytina (class Pinopsida) and Ginkgophytina (class
          Ginkgopsida) and Taxophytina (class Taxopsida) [syn: Gymnospermae,
           class Gymnospermae, division Gymnospermophyta]