Hi Keith!
Superficially,
Agave pelona and
Agave ocahui look a lot alike.
Agave pelona, when well grown, has a unique bright green, almost glowing coloration to the leaves, with ruby colored margins. It is a strikingly beautiful plant when at its best. Agave ocahui is a deeper green with lighter margins, although seedlings can be quite variable. Both of these species have smooth margins with no teeth. They both top out as about 2-3' balls.
Your plant has the classic tiny teeth of
Agave arizonica. However,
Agave arizonica rarely gets taller than a foot or so. I assumed your plant was in a 1 gallon pot and starting to bloom. If it is actually in a fifteen gallon pot then it is probably way too large to be
Agave arizonica. If it was in a one gallon pot, then this would be about the right size for a mature
Agave arizonica. This is a rare and seldom seen species. You are living very near it's
in situ location (up near Black Canyon), so you have a great opportunity to mimic it's requirements perfectly
!
The Monger