Tulip Varieties

1. Single Early Tulips
2. Double Tulips
3. Darwin Tulips
4. Lily Flowered Tulips
5. Single Late Tulips
6. Viridiflora Tulips
7. Triumph Tulips
8. Parrot Tulips
9. Fringed Tulips
10. Bunchflowering Tulips
11. Greigii Tulips
12. Fosteriana Tulips
13. Kaufmanniana Tulips
14. Species Tulips

Source: http://www.bachmans.com/tipsheets/bulbs_hardy/VarietiesTulipsandDaffs.cfm