Floristic monitoring of the 1,324 alignment tree bases of 15 streets in the district of Bercy, Paris, France, from 2009 to 2018. Nathalie Machon (CESCO, MNHN-CNRS-Sorbonne-Université) Data collectors : Noëlie Maurel, Marion Noualhaguet, Marion Dubois, Sébastien Julliard, Ambre Zéléla Bouvard, Paul Haenel, Florence Devers, Hélène Beaugeard, Gwendoline Chastel, laure Schneider-Maunoury and Mona Omar Centre d’Ecologie et des Sciences de la Conservation, Muséum national d’Histoire naturelle, 61 rue Buffon, 75005 Paris, nathalie.machon@mnhn.fr In cities, trees planted along streets host at their base a high number of spontaneous plants. Thus, they may provide shelters and corridors across the urban matrix. From 2009, we monitor urban tree bases in streets of Paris, France. Our objective is to follow the dynamics of these plant communities (Omar et al. 2018, 2019). Study area and floristic inventories The monitoring was performed in the 12th administrative district of Paris (Postal code: 75012; France; 48°50′26.91″N, 2°23′17.46″E), We monitored the 1,324 tree bases distributed along the 15 streets or avenues which contained at least 30 alignment trees in the district. Tree bases (TB) were for some of them covered by metal grills (grill/soil) to prevent soil compaction to preserve tree roots. The present file gives the list of all wild vascular plant taxa observed in each tree base, in May or June, each year from 2009 to 2018 except in 2013 because of a lack of observers. The taxonomic reference is the French Flora Reference TAXREF v8.0 (Gargominy et al., 2016).

{"references": ["Gargominy, O., Tercerie, S., R\u00e9gnier, C., Ramage, T., Schoelink, C., Dupont, P., \u2026Poncet, L. (2016). TAXREF v10. 0, R\u00e9f\u00e9rentiel taxonomique pour la France: M\u00e9thodologie, mise en \u0153uvre et diffusion. Paris, France: Mus\u00e9um National D'histoire Naturelle. Rapport SPN, 101, 144.", "Omar M, Al Sayed N, Barr\u00e9 K, Halwani J, Machon N. 2018. Drivers of the distribution of spontaneous plant communities and species within urban tree bases Urban Forestry & Urban Greening doi.org/10.1016/j.ufug.2018.08.018", "Omar M, Barr\u00e9 K, Al Sayed N, Halwani J, Machon N., 2019 Colonization and extinction dynamics among the plant species at tree bases in Paris (France) Ecology and Evolution doi.org/10.1002/ece3.4954"]}