| 释义 |
subdivision Cycadophytina
Thesaurus| Noun | 1.subdivision Cycadophytina - palmlike gymnosperms: includes the surviving order Cycadales and several extinct orders; possibly not a natural group; in some systems considered a class (Cycadopsida) and in others a subdivision (Cycadophytina or Cycadophyta)class Cycadopsida, Cycadophyta, Cycadophytina, Cycadopsida, subdivision Cycadophytaclass - (biology) a taxonomic group containing one or more ordersclass Gymnospermae, division Gymnospermophyta, Gymnospermae, Gymnospermophyta - 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)Cycadales, order Cycadales - primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical formsBennettitales, order Bennettitales - fossil gymnospermous plants of the Carboniferous |
subdivision Cycadophytina
Synonyms for subdivision Cycadophytinanoun palmlike gymnosperms: includes the surviving order Cycadales and several extinct ordersSynonyms- class Cycadopsida
- Cycadophyta
- Cycadophytina
- Cycadopsida
- subdivision Cycadophyta
Related Words- class
- class Gymnospermae
- division Gymnospermophyta
- Gymnospermae
- Gymnospermophyta
- Cycadales
- order Cycadales
- Bennettitales
- order Bennettitales
|