Poaceae is one of the most diverse families in Madagascar, but some lineages have not yet been assessed within a phylogenetic framework. This study focused on the threatened taxa of Chasechloa, historically associated with the South American forest grasses of the genus Echinolaena.
Silva et al. investigate the evolutionary relationships and origin of Chasechloa using molecular data produced by next-generation sequencing from museum specimens. Chasechloa was found to be only distantly related to Echinolaena. Miocene diversification of Chasechloa is temporally congruent with the origin of other angiosperms in dry forests of North Western Madagascar. Ants may have played a role in shaping the biology of Malagasy grasses as suggested by the presence of oil in the appendages of fertile florets.