Edward G. Gerdes Civil War Home Page
National Park Service Soldier and Sailor's System. and
Sikakis, Stewart, Compendium of the Confederate Armies, Florida and Arkansas, Facts on File, Inc., 1992, ISBN 978-0-8160-2288-5, page 93.
the NPS site has some "units" that either weren't really Arkansas Units, like Sanders Apparently or it has some units listed as a regiment, that was probably only a company such as Brandenburch's Arkansas Cavalry Regiment which was actually Brandenburch Company which was captured at Arkansas Post.
I am closed to some answer on all the "units" listed on the NPS site, except:
Armstrong's Arkansas Cavalry Regiment
Dan's Arkansas Cavalry Regiment
Fitzhugh's Arkansas Cavalry Regiment
Hindman's Arkansas Cavalry Regiment
Leve's Arkansas Cavalry Regiment
Rutherford's Arkansas Cavalry Regiment (I suspect this is a company from Dobbins 1st Arkansas Cav, but can't prove)
Sanders' Arkansas Cavalry Regiment
Shaver's Arkansas Cavalry Regiment
Weber's Arkansas Cavalry Regiment
Pall's Arkansas Cavalry Battalion
These are all very small "units", several have only one soldier and none has more that 6. I suspect the records are all parole records and may have been flawed from the very start, but I would like to account for them. A couple that have very few names, did infact exist, like Jackman's Regiment.