1. Acebes-Ginovés JR, Garcia A, León Arencibia MC, Rodríguez-Navarro ML, Aguilar MJDA, Gallo AG, Pérez de Paz PL, Delgado OR, Osório VEM, La Torre WW (2010) Pteridophyta, Spermatophyta. In: Arechavaleta M, Rodríguez S, Zurita N, García A (eds) Lista de especies silvestres de Canarias (hongos, plantas y animales terrestres). Gobierno de Canarias, Canary Island, pp 119–172
2. Ávila SP, Melo C, Berning B, Cordeiro R, Landau B, da Silva CM (2016) Persististrombus coronatus (Mollusca: Strombidae). in the early Pliocene of Santa Maria Island (Azores: NE Atlantic).: palaeoecology, palaeoclimatology and palaeobiogeographic implications on the NE Atlantic Molluscan Biogeographical Provinces. Palaeogeogr Palaeoclimatol Palaeoecol 441:912–923
3. Azevedo J (1998) Geologia e Hidrogeologia da Ilha das Flores (Açores—Portugal). PhD Thesis, Universidade de Coimbra
4. Bateman RM, Rudall PJ, Moura M (2013) Systematic revision of Platanthera in the Azorean archipelago: not one but three species including arguably Europe’s rarest orchid. PeerJ 1:e218
5. Bolle CKA, Seemann EG, Seemann B (1859) Bonplandia- Zeitschrift für die gesammte Botanik: Officielles Organ der KL-C. Akademie der Naturforscher, vol 7. Carl Rümpler, Paris, p 298