The dry tropical African rangeland grass and flower herbarium held at CIRAD in Montpellier comprises no fewer than 70 000 specimens of 5500 species, 60 types and plants, some of them almost 100 years old. The herbarium itself was set up in Mali in 1963, and after a time in Maisons-Alfort (France), it was transferred to Montpellier. It is to be presented to visitors during an open day on 18 November, at CIRAD's Maison de la Technologie, as part of the Fête de la Science.