Jiménez-Barron O., García-Sandoval R., Magallón S., García-Mendoza A., Nieto-Sotelo J., Aguirre-Planter E., Eguiarte L. E., Phylogeny, Diversification Rate, and Divergence Time of Agave sensu lato (Asparagaceae), a Group of Recent Origin in the Process of Diversification, Frontiers in Plant Science, 2020, 11:536135, doi: 10.3389/fpls.2020.536135
A phylogenetic analysis of broadly circumscribed Agave compares chloroplast markers with nuclear ITS. The authors reconstruct relationships, diversification and inflorescence evolution, noting the limited resolution of some data.