The Herbarium JACA is the biggest plant collection in Aragon and one of the most importants in Spain. Most of the Herbarium sheets, have been collected in the region, particularly in the Pyrenees, but there are also a good representation of the Flora of the Basc Country, Cataluña and other regions of the Iberian Peninsula.  Moreover, as a result of a long exchange with others Herbaria, a high number of samples of different European mountain ranges are represented.

The Herbarium JACA belongs to CSIC and it is located in the building of the Instituto Pirenaico de Ecologia at Jaca.