Always blooms in the green house
Just removed from the green house!
ooh that's pretty! What is it?
It surely looks like a variety of "Crown of Thorns" or Euphorbia var.
Check out these links and compare your plant to the photographs...
http://davesgarden.com/guides/pf/go/62924/
http://davesgarden.com/guides/pf/go/62925/
http://davesgarden.com/guides/pf/go/177326/
Congratulations on having one healthy looking specimen; hopefully you're wearing gloves when handling it.
