1 literature reference for Xylopia cayennensis Maas:

Author: Maas, P. J. M., Koek-Noorman, J. & Westra, L. Y. T.
Year: 1993
Title: Studies in Annonaceae. XVIII. New species from the Neotropics and miscellaneous notes.
Source: Bot. Jahrb. Syst. 115 (1): 93.