incertae sedis

Din incertae sedis technical term ( from the Latin genitive incerta sedes " seat unsafe " ), abbreviated as sed inc. , In the biological taxonomy identifies the uncertain systematic position of a taxon, such as the unclear assignment of a species to a particular family.

In botany, the use of the term probably derives from Antoine- Laurent de Jussieu, who in 1789 at the end of Genera plantarum some " incertae sedis plantae " aufführte.