Psyllocarpus sect. Psyllocarpus comprises P. asparagoides, P. bahiensis, P. goiasensis, P. laricoides, P. phyllocephalus, P. scatignae, P. schwackei. Psyllocarpus sect. Amazonica includes P. campinorum, P. cururuensis, P. psyllocarpoides.
Psyllocarpus intermedius and Psyllocarpus densifolius are found in the same geographical region at sect. Psyllocarpus but are morphologically distinct. Carmo et al. (2021) recognized the monotypic genus Diadorimia to accommodate P. densifolius, while the determination of P. intermedius is pending further investigation.[2]