Gonçalves, A. C., Ouhammoud, A., Amirouche, R., Santos, C., Figueiredo, E., & Silveira, P. (2023).

A taxonomic revision of Calendula (Asteraceae) in Morocco, including some taxa from Algeria and Tunisia

. Phytotaxa, 605(1), 1–83. https://doi.org/10.11646/phytotaxa.605.1.1