http://landscaping.about.com/od/flowersherbsgroundcover1/a/plant_lists.htm

Tulips

• Single Early,
• Double Early,
• Triumph,
• Darwin Hybrid,
• Single Late,
• Lily-flowered,
• Fringed,(my favorite)
• Viridiflora,
• Rembrandt,
• Parrot
• Double Late,
• Kaufmanniana,
• Fosteriana,
• Griegii and
• Wild Tulips.