Taxonomic revision of the genus Calendula (Asteraceae) in the Canary Islands Author Simão, Inês Departamento de Biologia e CESAM, Universidade de Aveiro, 3810 - 193, Aveiro, Portugal. Author Reyes-Betancort, J. Alfredo Jardín de Aclimatación de la Orotava (ICIA), C. Retama, 2, 38400 Puerto de la Cruz, Santa Cruz de Tenerife, Spain. Author Talhinhas, Pedro LEAF- Linking Landscape, Environment, Agriculture and Food, Associate Laboratory Terra, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda, Lisboa, Portugal. Author Morais-Cecílio, Leonor LEAF- Linking Landscape, Environment, Agriculture and Food, Associate Laboratory Terra, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda, Lisboa, Portugal. Author Silveira, Paulo Departamento de Biologia e CESAM, Universidade de Aveiro, 3810 - 193, Aveiro, Portugal. text Phytotaxa 2024 2024-03-11 640 2 125 160 http://dx.doi.org/10.11646/phytotaxa.640.2.3 journal article 10.11646/phytotaxa.640.2.3 1179-3163 13213550 Key to the species of Calendula in the Canary Islands 1. Cymbiform achenes with a more or less developed ventral wing; disc florets at least 60 ........................................ 2. C. officinalis – Cymbiform achenes without a ventral wing; disc florets up to 50, more frequently between 15–25 .............................................. 2 2. Outer achenes rostrate or bialate with incise-dentate lateral wings, never trialate ...................................................... 1. C. arvensis – Outer achenes rostrate and trialate with entire to sub-entire lateral wings ....................................................................................... 3 3. Capitula diameter (0.7) 0.9–1.1 (1.3) cm; rostrate achenes (4.9) 6.2–10.6 (13.5) mm long; leaves strictly linear-oblong ................ ...................................................................................................................................................................................... 4. C. sventenii – Capitula diameter (1.4) 1.7–2.7 (3) cm; rostrate achenes (10.4) 13.7–22 (25) mm long; leaves ovate to oblong, less frequently oblanceolate .................................................................................................................................................................. 3. C. ricardoi