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