Help with euphorbia variety?

[Chris Strawn]

My friend is trying to replace a lost cactus plant but does not know the 
name for it.  It is a euphorbia, but is not as stiff or upright as cow's 
horn variety.  It might have "dragon" as a part of its common name.  It 
was pictured in a Sunset article on euphorbias a number of years ago.  
Looking for name and place to locate a replacement.  Or a book that might 
show a picture of more varieties.   She is in Redding, CA.