Adil GÜNER, Vehbi ESER - optima

PHYLOGENY AND BIOGEOGRAPHY OF THE GRASS GENERA
ANTHOXANTHUM L. AND HIEROCHLOË R.BR. (POACEAE;
POOIDEAE).
M. PIMENTEL-PEREIRA, 1,2 ; E SAHUQUILLO, 1 & C. BROCHMANN, 2 .
1 Departamento de Bioloxìa Animal, Bioloxìa Vexetal e Ecoloxìa, Facultade de Ciencias, Universidade da
Coruña. Campus da Zapateira sn. 15071 A Coruña, Spain
2 National Centre for Biosystematics, University of Oslo. P.O Box 1172 Blindern. NO-0318 Oslo, Norway
The taxonomic status of the genera Anthoxanthum L. and Hierochloë R. Br. has been widely
discussed. Traditionally, Anthoxanthum includes grasses with one fertile and two barren
florets and which naturally occur in Eurasia and Africa, whereas Hierochloë presents more
than one functional floret and also occurs in Oceania and the Americas, but not in Africa. The
distinction between these two genera, quite clear in the European context where both were
first described, are blurred in other regions.
In our study, we aim at clarifying the phylogenetic, the taxonomic and the biogeographic
relationships between the two genera and among their species. For this, we use plastid (trnL-
F, trnH-psbA) and nuclear (ITS) DNA markers. Our preliminary results indicate that
Hierochloë is paraphyletic, whereas Anthoxanthum is clearly monophyletic only when the
morphologically transitional forms between both genera are included. Besides, we postulate
that Anthoxanthum colonized Africa at least twice and that the polyploids A. amarum Brot.
and A. maderense Teppner originated from Mediterranean diploids.
Keywords: Anthoxanthum , Hierochlo. Poaceae, Phylogeny, Biogeography
ENDEMIC TAXA OF THE SECTION COTA (J.GAY)RUPR.
(ANTHEMIS L.), THREATENED CATEGORIES
135
71
Posters