In 2011, "Coffea" absorbed the twenty species of the former genus "Psilanthus" due to the morphological and genetic similarities between the two genera. Historically, the two have been considered distinct genera due to differences in the length of the corolla tube and the anther arrangement: "Coffea" with a short corolla tube and exserted style and anthers; "Psilanthus" with a long corolla tube and included anthers. However, these characteristics were not present in all species of either respective genus, making the two genera overwhelmingly similar in both morphology and genetic sequence. This transfer expanded "Coffea" from 104 species to 124, and extended its native distribution to tropical Asia and Australasia.