Calendula suffruticosa

Gonçalves, Ana Carla, Ouhammoud, Ahmed, Amirouche, Rachid, Santos, Conceição, Figueiredo, Estrela & Silveira, Paulo, 2023, A taxonomic revision of Calendula (Asteraceae) in Morocco, including some taxa from Algeria and Tunisia, Phytotaxa 605 (1), pp. 1-83 : 25

7. Capitula at the apex of usually branched stems bearing cauline leaves; cymbiform and sub-cymbiform achenes, when present, usually with ventral wings; 2n =32 ..................................................................................................................... 11. C. suffruticosa

– Capitula at the apex of unbranched stems not bearing cauline leaves for near half of their length, or with very small cauline leaves; cymbiform achenes, when present, without ventral wings; 2n = 18 ................................................................................................ 8

8. Leaves mostly densely white-arachnoid pubescent .......................................................................................................................... 9

– Leaves mostly glabrous or glandular pubescent ............................................................................................................................. 10