Calendula suffruticosa
subsp. riffiniensis; subsp. tazzea
Base de données des Plantes d'Afrique. Conservatoire & Jardin botaniques de la ville de Genève.
A.C. GONCALVES et al. - A taxonomic revision of Calendula in Morocco, including some taxa from Algeria and Tunisia. Univ. of Aveiro. p. 237-356 (2018)
Calendula suffruticosa subsp. riffiniensis
In C. Gonçalves et al. (2018), fig. 77, p. 322
A taxonomic revision of Calendula in Morocco
Calendula suffruticosa subsp. tazzea
In C. Gonçalves et al. (2018), fig. 78, p. 323
A taxonomic revision of Calendula in Morocco