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| Flora of Macaronesia | |
|---|---|
| Name | Macaronesia |
| Location | North Atlantic Ocean |
| Countries | Portugal, Spain, Cape Verde |
| Subdivisions | Azores, Madeira, Canary Islands, Cape Verde |
Flora of Macaronesia is the assemblage of vascular plants, bryophytes, and lichens that occur across the North Atlantic archipelagos of the Azores, Madeira, the Canary Islands, and Cape Verde. This flora combines high levels of endemism, relict elements, and recent colonists, shaped by island biogeography, Pleistocene climate cycles, and long-distance dispersal via the North Atlantic Drift and avifauna such as the European storm petrel and Cory's shearwater. Major floristic studies and checklists have been produced by institutions including the Royal Botanic Gardens, Kew, the Jardim Botânico da Madeira, and the Instituto Nacional de Agricultura e Pescas.
The flora occurs within the biogeographic regions influenced by the Macaronesian Islands cluster and lies at the crossroads of the Mediterranean Basin, Prairies and Steppes, and Afrotropical realm biotas, producing affinities with Iberian Peninsula, North Africa, and West African floras. Island area, elevation (e.g., Pico), isolation, and volcanic substrate (e.g., Teide) drive species richness and endemism patterns recognized by researchers from the University of Coimbra, University of La Laguna, and the Canary Islands Government. Phytogeographers reference the concept of island syndromes used by scholars associated with the Linnean Society of London and the International Union for Conservation of Nature.
Several plant lineages show marked endemism: the laurel forest element includes species such as Persea indica and Ocotea foetens, while the Macaronesian endemics include genera like Laurus and Newportia. Notable endemic species are Echium wildpretii (Canary Islands), Viburnum treleasei (Madeira), Cytisus proliferus (Tenerife), Viola uliginosa (Azores specialists), and the relict fern Culcita macrocarpa. Endemic families or near-endemic lineages discussed in monographs from Köhler's Medicinal Plants include representatives of the Echium clade, the Macaronesian Asteraceae radiation, and island derivatives in the Fabaceae and Brassicaceae.
Vegetation mosaics range from lowland xeric scrub on Lanzarote and Fuerteventura to humid cloud forests on Madeira and the Azores, with laurisilva forming a flagship habitat conserved in sites like the Laurisilva of Madeira World Heritage area. Heathlands and pine forests (e.g., Pinus canariensis plantations) dominate mid-elevations, while coastal dune systems and salt-tolerant communities occur on islands such as Sal. Mountaintop alpine cushions and high-elevation scrub around Teide National Park provide niches for endemics like Tenerife bugloss and high-elevation Asteraceae specialists. Habitat descriptions are incorporated into conservation planning by agencies including the European Commission and the African Union in transregional contexts.
Macaronesian plant lineages derive from multiple source areas: European and Mediterranean taxa dispersed westward across the Gulf Stream corridor, North African elements entered via the Sahara-adjacent routes, and some West African and transatlantic affinities are evident in Cape Verde. Molecular phylogenetic work by teams at University of Oxford, University of Lisbon, and University of Bergen shows repeated colonization followed by in situ radiations in groups such as Echium, Argyranthemum, and Pericallis. Palaeobotanical records, palynological studies linked to the Quaternary glaciation, and biogeographic models developed in collaboration with the International Biogeography Society illuminate vicariance, founder-event speciation, and adaptive divergence under island isolation and volcanic succession dynamics.
Endemic-rich habitats face threats from land-use change, urbanization driven by tourism in Funchal and Santa Cruz de Tenerife, wildfire exacerbated by climate change studied by Intergovernmental Panel on Climate Change scenarios, and biological invasions involving species introduced via shipping ports such as Mindelo and Ponta Delgada. Conservation actions are coordinated by organizations including the Biosphere Reserves network, the Council of Europe Natura 2000 framework for Portugal and Spain, and local NGOs such as the Madeira Botanical Garden conservation programs. Several taxa are listed on the IUCN Red List with critical statuses, and ex situ collections are maintained at institutions like Royal Botanic Gardens, Kew, the Jardim Botânico do Funchal, and university herbaria.
Human colonization and commerce introduced crops, ornamental plants, and weeds from the Age of Discovery era onward, with historic introductions of Eucalyptus spp., Acacia spp., and agricultural species that altered fire regimes and hydrology. Traditional uses by island communities included medicinal and timber uses documented by the Museu de História Natural de Sintra and ethnobotanical surveys by the University of La Laguna. Contemporary invasive species management addresses taxa such as Carpobrotus edulis, Opuntia ficus-indica, and invasive rodents mediating seed predation, with biosecurity measures implemented through port authorities influenced by policies from the European Commission and bilateral agreements between Portugal and Spain as well as engagement with Cape Verdean government programs.