21. The ginkgos and cycads also appeared during this period. 22. Cycad sago is used for many of the same purposes as palm sago.23. Cycads , which are not flowering plants, are also pollinated by insects.24. The three extant families of cycads are Cycadaceae, Stangeriaceae, and Zamiaceae. 25. Common names includes Natal Grass Cycad , Hottentot's Head and Stangeria. 26. They would have been an adaptation for eating tough vegetation such as cycads . 27. Properly dried cycad seed flour may be stored for several years without deterioration. 28. Genetic studies have shown this was when angiosperms separated from cycads and gymnosperms. 29. These cycads are generally unbranched, tall, and with persistent leaf bases. 30. Some types of plants have flagellated sperm, including the Ginkgo and cycads .
