It's tough for me to imagine a lot of lumping (and splitting) that has taken place, but it's not likely to change much. I hope I'm not out of line for doing this from memory, but it seems that A. squarrosa is from the horn of Africa (Yemen or Oman) and A. zanzibarica is obviously from Zanzibar; ergo, these two species don't come close to overlapping either. The most amazing to me will always be Aloe alooides… an Aloe that looks like an Aloe. Perhaps someone will name a Manfreda M. agavoides so that it can eventually become Agave agavoides.
Since the taxonomists don't seem to agree on much of the nomenclature, it's doubtful that we'll be able to resolve these issues on this forum.
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