About the occurrence of Elatine macropoda and E. gussonei (Elatinaceae) in Sicily and lectotypification of their names

Morphological and nomenclatural investigations for two critical Mediterranean species of Elatine, i.e., E. macropoda gussonei, as well their correct distribution in Sicily, are discussed. These names lectotypified on herbarium specimens kept, respectively, at NAP FI. The morphological carried out both the types, several living dried material collected southern Lampedusa, Malta (loci classici included), allowed to individuate reliable diagnostic characters that can be used a identification species. most relevant differential features are: ratio petal/sepal, size shape seed testa pits, arrangement row number. According our results, only occurs Hyblaean territory (Sicily), which is locus classicus, whereas gussonei Lampedusa Maltese islands only. However, further in-depth research necessary clarify overall area. Finally, an analytic key Elatine provided.