ibclogo XVI International Botanical Congess


Abstract Number: 4329
Poster No. = 619


SYSTEMATIC RELATIONSHIP IN RHYNCHOSIA (CAJANINAE - PHASEOLEAE - PAPILIONOIDEAE-FABACEAE) FROM NEOTROPICS REGIONS


Renee H. Fortunato, National Council Research at Institute of Biological Resources, INTA, Castelar, Buenos Aires, Argentina.


The genus Rhynchosia Lour. has more than 200 species living in pantropical and subpantropical regions. Fifty-seven occurs in the New World with distribution in South and Central America and the Caribbean. The infrageneric level of the American species was placed in the Sections: Sects. Copisma (E. Mey.) Endl.,Arcyphyllum (Ellis) Torr. & Gray, and Cyanospermum (Wight & Arn.) Benth. (Old Word introduced species reported). In this biosystematic revision, morphological features of vegetative parts, flowers, inflorescens, fruits, seeds, pollen and structural forms were related and analyzed. These characters revealed evidences to circumscribe Sect. Arcyphyllum, to describe two news Series within Sect. Copisma and to recognize Sect. Phaseoloides Benth. emend Fortunato. The biogeography among the taxa has shown an infraspecific variation in the widespread species. The phylogeny and classification of Rhynchosia in America and its evolutionary relationship with the closely related pantropical genus Eriosema (DC.) G. Don, within the subtribe Cajaninae Benth. will be proposed in numerical taxonomy In order to confirm the phylogeny presented, chloroplasts DNA's is being studied.


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