Abstract Detail

Systematics

Iganci, Joao [1], Monteiro, Thiago Cobra [2], Mohammad, Vatanparast [3], Miotto, Silvia [4], Simpson, Beryl [5], Klitgaard, Bente [6], Gwilym, Lewis [7], Fortuna-Perez, Ana Paula [2].

Towards a monophyletic infrageneric circumscription for Adesmia DC. (Dalbergieae, Leguminosae): a taxonomic revision of Adesmia series Muricatae.

The Dalbergioid legumes (Papilionoideae, Leguminosae) are part of a predominantly South American lineage that comprises Amorpheae and Dalbergieae clades. The tribe Dalbergieae consisting of clades Adesmia, Pterocarpus, and Dalbergia. The Adesmia clade comprises five genera which are highly adapted to dry environments, with Adesmia as the most speciose, and currently containing 204 accepted species and 37 varieties, classified in two subgenera (Adesmia subg. Adesmia and Adesmia subg. Acanthadesmia) and 43 series. The infrageneric classification of Adesmia was established in the late 1960’s by Burkart, based exclusively on morphological characters, but the two subgenera appeared paraphyletic in a recent phylogenetic study. Adesmia almost exclusively inhabits the South American Arid Diagonal, from southern Peru to Tierra del Fuego in southern Argentina, with many species occurring in some of the driest environments on Earth. Within Adesmia, three series predominantly inhabit the Pampas grasslands: Adesmia subg. Adesmia ser. Muricatae, A. subg. Adesmia ser. Bicolores, and A. subg. Adesmia ser. Subnudae. These taxonomically complex series display several overlapping morphological characters and geographical distribution ranges. We conducted a thorough systematic study of Adesmia, combining phylogenetic analyses based on 87 nrITS DNA sequences with a taxonomic revision of Adesmia series Bicolores, Subnudae and Muricatae. Four major clades displaying geographical and morphological coherence were recovered. Adesmia series Subnudae and Bicolores are nested within series Muricatae, leading to a new classification where the first two were synonymized under series Muricatae. Three varieties were elevated to species level in the taxonomic revision, and another six were placed in synonymy, under accepted species. Eight lectotypes, one neotype and one epitype were designated. We recognize 21 species in the newly circumscribed series Muricatae and provide a species identification key, descriptions, illustrations, and maps, together with comments on phenology, taxonomy, etymology, distribution, habitat, and conservation status.

1 - Federal University of Pelotas, Botany, Rua Cidade do Porto 1276, Pelotas, Rio Grande do Sul, 96083150, Brazil
2 - UNESP, Botucatu, SP, Brazil
3 - University of Copenhagen, Department of Geosciences and Natural Resource Management, Rolighedsvej 23, 1958 Frederiksberg C, Denmark
4 - Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
5 - The University Of Texas At Austin, Integrative Biology, 205 West 24th St., Mail Stop C0930, Austin, TX, 78713.0, United States
6 - 73 Maguire Drive, Richmond, Surrey, TW107XX, United Kingdom
7 - Royal Botanic Gardens, Kew, 73 Maguire Drive, Richmond, TW107XX, UK

Keywords:
Adesmia clade
Fabaceae
Papilionoideae
phylogeny
Taxonomy .

Presentation Type: Oral Paper
Number: SYST II002
Abstract ID:451
Candidate for Awards:None