Five molecular markers reveal extensive morphological homoplasy and reticulate evolution in the Malva alliance (Malvaceae).
The Malva alliance is a well-defined group with extensive morphological homoplasy. As a result, the relationships among the taxa as well as the evolution of morphological traits have remained elusive and the traditional classifications are highly artificial. Using five molecular markers (nuclear ITS, plastid matK plus trnK, ndhF, trnL-trnF, psbA-trnH), we arrived at a phylogenetic hypothesis of this group, the genera Alcea, Althaea and Malvalthaea being studied here for the first time with molecular data. Althaea and, in particular, Lavatera and Malva are highly polyphyletic as currently circumscribed, because their diagnostic characters, the number and degree of fusion of the epicalyx bracts, evolve in a highly homoplasious manner. In contrast, fruit morphology largely agrees with the molecularly delimited groups. Hybrid origins confirmed for the genus Malvalthaea and for Lavatera mauritanica and hybridization in the group of ruderal small-flowered mallows underline the importance of reticulate evolution in shaping the history of this group and complicating the interpretation of morphological evolution.
Escobar García
Pedro
P
Department of Biogeography and Botanical Garden, University of Vienna, Faculty Center Botany, Rennweg 14, 1030 Vienna, Austria. pedro.escobar.garcia@univie.ac.at
Schönswetter
Peter
P
Fuertes Aguilar
Javier
J
Nieto Feliner
Gonzalo
G
Schneeweiss
Gerald M
GM
D001499:Bayes Theorem; D018744:DNA, Plant / Q000235:genetics; D019143:Evolution, Molecular; D005819:Genetic Markers; D049810:Genetic Speciation; D006824:Hybridization, Genetic; D019660:Malvaceae / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics*; D010802:Phylogeny; D018087:Plastids / Q000235:genetics; D017422:Sequence Analysis, DNA
D018744:DNA, Plant; D005819:Genetic Markers