The objective of the IHMAGES project is to improve knowledge of the evolution of plant biodiversity in the Massif Central through the exploitation of historical and current grassland data. It is presented by the University Clermont Auvergne (UCA), UniVegE department responsible for the management of the herbarium which is the largest collection of the Massif Central with 620,000 shares. It consists of 3 components: computerisation of 100,000 herb shares (800,000 data) in the database, with transfer to the S.I.N.P. and G.B.I.F databases and mobilisation of the national web platform E-RECOLNAT (ANR 11-INBS-0004) as part of a “Herbonautes” participatory science programme; conservation of collections with reception of new grasslands and development of a dedicated space in a UCA building. Diachronic monitoring of bio-indicative plant species in relation to global, climatic and anthropogenic changes. The programme will mainly impact the habitats of peatlands and herbaceous habitats of altitude, as well as sites located in the regions AuRA, Burgundy-Franche-Comté, New Aquitaine, Occitanie. The institutional partners are: the National Museum of Natural History, manager of the national platform E-RECOLNAT and various institutions owning herb trees: House of the volcanoes of Aurillac; Museum of Montbrison; MUPOP Montluçon; Puy-en-Velay Museum; City of Mende; University of Limoges; Museum of Moulins; Museum of Autun; CBNMC.