Gymnosperms have seeds, but lack ovaries.  These plants, which developed  earlier than angiosperms, branched into four modern divisions, Ginkgophytes,  Cyadophytes, Gnetophytes, and Coniferophytes.

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Ginkgophytes
Cycadophytes
Gnetophytes
Coniferophytes

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Progymnosperms

Geologic Timeline