English

Abstract

Ecdeiocolea rigens B.G.Briggs is described and illustrated, being the second species of its genus and third species recognised in Ecdeiocoleaceae. E. rigens is abundant on sand plains in a region north and east of Geraldton in the west of Western Australia. It occurs sympatrically, without evidence of intergradation, with the more widespread E. monostachya F. Muell. and is distinguished by its extensively rhizomatous habit, larger size and rigid culms. Brief comment is made on culm anatomy and DNA findings. A lectotype is selected for E. monostachya.