資料來源 : WordNet®

class Gymnospermae
     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},
          {Gymnospermophyta}, {division Gymnospermophyta}]