[4] As of May 2024[update], Plants of the World Online divided the nine former species of Xylothamia among Aquilula, Gundlachia, and Medranoa.
[6][7] As of May 2024[update], Plants of the World Online accepted the transfer, and treated Xylothamia as a synonym of Gundlachia.
[6] In 2007, Guy L. Nesom considered that four separate genera were not justified, even though there were morphological differences among them, and placed all five species in Medranoa.
[9] As of May 2024[update], Plants of the World Online accepted these placements, dividing the nine former species of Xylothamia among Aquilula, Gundlachia, and Medranoa.
[4] As of May 2024[update], Plants of the World Online divided the nine former species of Xylothamia among Aquilula, Gundlachia, and Medranoa.