The variety of the museum's collections is reflected in its two botanical collections, started at the beginning of the 18th century and finished in the mid 19th century. The earlier collection comes from the Marian Library in the Saint Francis convent in Barcelona, and bears annotations by the French botanist P.A. Pourret. The other collection dates from the second half of the 19th century and contains more than three thousand botanic specimens. It was traditionally known as the Balvey herbarium, although a detailed study has shown it to be fundamentally the work of J. Pujol and O. Bordère.