Snuffy, You didn't read quite far enough in the reference
http://en.wikipedia.org/wiki/.45_Colt
Here's the quote "Original name"
The designation ".45 Long Colt" originated amongst military personnel to prevent confusion with the smaller .45 Schofield. It has become a widely used alternative name for the cartridge, and adopted by Colt for use in designating the chambering in its own Single Action Army revolvers.
It always tickles me when people get so anal about a name. Actually, the cartridge headstamp is marked 45 Colt (so they are half right), but if you look at a real Colt revolver, it will say 45 LC (Long Colt), just like the above reference says. So ..... either 45 Colt or 45 Long Colt would be correct. See:
http://www.coltsmfg.com/cmci/saarmy45LC.asp
Cartridge = 45 Colt. Colt SAA revolver = 45 Long Colt.