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Divisions and representing species of the gymnosperms

Specify the major divisions and representing species of the gymnosperms?

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This group of plants is divided into following species:

a) Conifers (sequoia, pine, cypress), which have flowers termed as strobiles (cones),
b) Cycads (very ancient gymnosperms, such as cycads which is used in garden architecture, that also form strobiles),
c) Gnetaceae (gnetum), and
d) Ginkgos (the known species is Ginkgo biloba).

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