The Parc botanique de Launay (90 hectares), sometimes known as the Parc botanique d'Orsay or the Parc de l'Université Paris XI, is a botanical garden located on the Université Paris-Sud XI campus at 3 rue Georges-Clemenceau, Orsay, Essonne, Île-de-France, France, and open daily; admission is free.
The university was created in 1954 on a 240-hectare campus along the river Yvette. In 1965 portions of the campus were designated a botanical park, which today contains about 15,000 plants representing some 2500 taxa, including 333 genera and 99 families. The campus also contains about 550 m² of research greenhouses.
The park's rare and unusual woody plants include Aesculus indica, Alangium platanifolium, Asimina triloba, Baillona juncea, Cornus capitata, Cudrania tricuspidata, Daphniphyllum macropodum, Eucalyptus pauciflora, Firmania simplex, Foresteria neomexicana, Hovenia dulcis, ancient roses (150 cultivars), Camellia (140 cultivars), apples (93 cultivars), and Madagascar endemics including Alluaudia and Pachypodium.