I grabbed the information out of the Pilbeam book on Mammillaria. The original idea was to create a look up reference for my plant database to give more detail to the Mammillaria records.
Under Genus there is subgenus, section, series, group and species. I've identified each plant as to its appropriate place and placed it in a table. I also have a page that gives detail on the Series description which shows the attributes they used to determine the organization.
I put all of this in a three sheet Excel workbook. If you are interested in getting a copy, send me a PM with your email address. I will send in 1997-2003 XLS format unless otherwise requested.
Subgenus Count of species
Cochemiea 5
Dolichothele 6
Mamillopsis 1
Mammillaria 248
Mammilloydia 1
Oehmea 1
Grand Total 262
Mammillaria hierarchy based on Pilbeam book
Mammillaria hierarchy based on Pilbeam book
Disclaimer: I'm in sunny Arizona, so any advice I give may not apply in your circumstances.
Tim
Tim