Abstract
The genusCheirolophus is a good example of a genus with a western Mediterranean distribution, with an important centre of speciation in Macaronesia. We carried out an electrophoretic study on representatives of Iberian-North African species ofCheirolophus as well as species from the Canaries. In addition, some species of the generaCentaurea, Crupina andSerratula were examined. Our results show high genetic identities between taxa and low genetic diversity inCheirolophus from the Canaries. This is the same pattern found in plants from other oceanic archipelagos and it suggests a recent colonization of the Canaries by the genusCheirolophus. The Iberian species exhibit high genetic identities, suggesting that the genus as a whole is younger than has been suggested. Cluster analysis shows little correlation between accepted taxonomic delimitation of the species ofCheirolophus and isozyme variation, which points towards very recent speciation in the genus; not only in the Canarian species, but also in the continental group. On the other hand, cluster analysis reinforces the segregation ofCheirolophus as a genus distinct fromCentaurea and supports a closer relationship to the genusSerratula.
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Garnatje, T., Susanna, A. & Messeguer, R. Isozyme studies in the genusCheirolophus (Asteraceae:Cardueae-Centaureinae) in the Iberian Peninsula, North Africa and the Canary Islands. Pl Syst Evol 213, 57–70 (1998). https://doi.org/10.1007/BF00988908
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DOI: https://doi.org/10.1007/BF00988908