Phylogenetic relationships in the complex Galactia-Collaea-Camptosema (Diocleinae-Phaseoleae-Papilionoideae-Leguminosae) from southern South America

S. M. SEDE, D. TOSTO, L. POGGIO, R. H. FORTUNATO

Vienna, Austria

Congreso; XVII International Botanical Congress; 2005

International Association of Plant Taxonomy

The genera Galactia P. Browne (pantropical), Camptosema Hook. & Arn. (neotropical) and Collaea DC. (neotropical) are grouped in a complex with exomorphological similarities and different criteria were adopted to delimit them. The phylogenetic hypothesis based on morphological characters do not support the monophyly of Galactia and Camptosema. Southern South American species were studied including those which generate conflict in the generic delimitation of the complex. The aim of this study was to analyze the phylogenetic relationships of the species by the parsimony method using nuclear (ITS) and chloroplast (trnL-trnF IGS) sequence data. The results obtained did not corroborate the monophyly of Galactia and Camptosema in agreement with the previous phylogenetic analyses based on morphological characters. The chromosome characteristics of the group were also evaluated and new records for the conflictive species are reported. The results of this study together with the morphological revision point out the necessity of reviewing the generic circumscription of the complex.