Plant Ecology and Evolution vol:144 issue:1 pages:44-63
Background Pycreus, Kyllinga, and Queenslandiella cluster together with Cyperus within the Cyperus s. lat. clade, one of the two large clades in Cypereae. However, in contrast with Cyperus, they have laterally flattened pistils/nutlets. Pycreus, Kyllinga and Queenslandiella form morphologically well circumscribed independent genera. In the context of a broader systematic project to work out a well supported, evolution based taxonomy for Cyperus s. lat., we present in this paper general morphological and developmental data of species of Pycreus in comparison with three species of Cyperus, including C. laevigatus with dorsiventrally flattened nutlets.