Abstract
Carvalho, J.A., Pontes, T., Batista-Marques, M.I. & Jardim, R. 2010. A new species from the island of Porto Santo (Madeira Archipelago). Anales Jard. Bot. Madrid. 67(2): 87-96. A new species endemic from the island of Porto Santo (Madeira Archipelago) is described as Echium portosanctensis J.A. Carvalho, Pontes, Batista-Marques & R. Jardim. Morphological studies based on reproductive and vegetative traits revealed a set of diagnostic characters confirming separation of E. portosanctensis from other recognized species at sectional level. A taxonomic diagnosis, a morphological description and illustrations of the new species are provided. Images, distribution maps, ecological data and a key for Madeiran species of Echium are also provided. Diagnostic characters, conservation status, threats and speciation mechanisms are discussed. In addition, reports on the occurrence of E. candicans on the island of Porto Santo are also discussed.
Highlights
Echium (Boraginaceae), with 28 endemic species, is one of the most diverse genera in Macaronesia (Bramwell, 1972; Santos, 1983)
Evolutionary studies using molecular markers conducted by Böhle & al. (1996) concluded that the Macaronesian taxa of Echium are the result of colonization from a single continental-herbaceous ancestor
The genus Echium is represented in Madeira archipelago by three endemic species: E. candicans on the island of Madeira, E. nervosum on the islands of Madeira, Desertas and Porto Santo and E. portosanctensis on the island of Porto Santo
Summary
Echium (Boraginaceae), with 28 endemic species, is one of the most diverse genera in Macaronesia (Bramwell, 1972; Santos, 1983). On the island of Porto Santo, on Pico Branco, and referred that this taxon differed from typical E. nervosum on leaf shape, texture and colour, as well as the colour of the inflorescence.
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