Below is a list of common houseplants that are acceptable for your cat to munch on.  Note that there are conflicting reports about the aloe vera plant - because I received an email about a cat that died after ingesting it, I am not putting it on this "approved" list.

Note that if you want to provide a plant that your cat can eat (so hopefully he will leave your plants alone), you can purchase small containers of oat grass. 

• African violet (Saintpaulia)
  
• Aluminum plant
  
• Any of the true ferns (Boston fern, maidenhair, etc.)
  
• Cacti (but make sure they are real cacti, not just a succulent)
  
• Catnip
  
• Coleus
  
• Gloxinia (Sinningia)
  
• Goldfish plant (Hypoestes)
  
• Grape ivy (Cissus)
  
• Hanging African Violet (Episcia)
  
• Lipstick vine (Aeschynanthus)
  
• Miniature roses
  
• Pepperomia
  
• Prayer plant (Maranta)
  
• Shrimp plant (Beleperone guttata)
  
• Spider plant (Chlorophytum)
  
• Swedish Ivy (Plectranthus)
  
• Sweet potatoes (Ipomoea)
  
• Variegated philodendron leaf peperomia
  
• Wandering jew (Zebrina)
  
• Wax begonias (Begonia semperflorens)