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  1. Cycad - Wikipedia

  2. The World List of Cycads

  3. List of cycads | Cycad Species, Endangered Plants, Gymnosperms …

  4. List of cycad species by country - Wikipedia

  5. Cycad | Description, Gymnosperm, Species, Examples, Uses, …

  6. The World List of Cycads, online edition - GBIF

  7. The world list of cycads | The Botanical Review - Springer