First appointment of the invasive Cyperus eragrostis (Cyperaceae) as an established species in Tunisia.

The South American weed Cyperus eragrostis Lam. (Cyperaceae) is reported for the first time in the wild from Tunisia, North Africa. A brief description of the species is given and it is illustrated in its Tunisian habitat. Its actual distribution is presented and discriminatory characteristics as compared to C. flavescens, a native species with which it has been confused for some time, are commented. [ABSTRACT FROM AUTHOR]