Samain, M.-S., Najarro, F.H. & Salas, E.M.M. (2014)

First record of the critically endangered Hydrangea steyermarkii Standl. (Hydrangeaceae) in Mexico, and description of a new widespread Hydrangea species of Mesoamerica

. Phytotaxa 162 (4): 181–197. https://doi.org/10.11646/phytotaxa.162.4.1