Hello Roy,
botanical gardens, plant collectors, taxonomas, etc. often provide their plants with numbers that then apply only to those particular plants or genotypes; in a file there is or should then give more detailed information about the origin (persons, bot gardens, game location, etc.).
The H.AM. numbers go back to Wilbert Hetterscheid, who worked as a leading taxonoma for the genus Amorphophallus at the universities of Leiden and Wageningen (both in NL) and has described and determined many species.
H probably stands for Hetterscheid and AM for Amorphophallus.
(His H.AR. numbers not only stand for Arisaema species, there are also pseudohydrosms, taccarum and other araceic genera AR numbers)
The AGA numbers are internal numbers of Alan Galloway
(https://alangallowaybotanicals.com/ ), although H.AM. numbers can be behind his AGA numbers; e.g. AGA-1200-01 is identical to Wilbert Hetterscheid's H.AM.970, which is a very nice and widely used Amorphophallus maxwelii genotype or clone.
Thus, many collectors have their system of names, which is especially helpful in the labelling of the many plants; my BS-68 is e.g. my internal name for H.AM 970 = AGA-1200-01
The Ag and Wb numbers come from this article:
https://www.researchgate.net/publication... Dennst_Nicolson , although I strongly suspect that these are simply internal numbers of the plants that the authors have collected in various areas in Bali and Lombok for their searches.
I think that Ag and Wb can be derived from the names of two of the authors (AGUNG KURNIAWAN♥, I PUTU AGUS HENDRA WIBAWA, BAYU ADJIE).
Ag = AGUNG and Wb presumed = WIBAWA
This is, of course, speculative; one would have to write to the authors and ask.
I had first suspected that there might be variety denominations of agriculturally grown paeoniifolius or mullerii behind it, but I think that they are simply collection numbers...
Happy growing, Bernhard.