I think I'm with Faldage "adhocracy"

It's your Q so it's your call, inselpeter.

It looks as if it has been used both ways.

For instance, as "Ad Hocracy" as the lead in this article:

Judicial Ad Hocracy: The Right to Free Speech is Not the "Right to an Audience"

http://www.capmag.com/article.asp?ID=1704

As well as in this definition (worldreference.com)

ad hocracy [æd'hɒkrəsý]

noun: management that responds to urgent problems rather than planning to avoid them

The term has been around much longer than the book so I guess you can ad hoc it anyway you want. [I guess you will anyway. ]