Fig. 3

Relationship between adjusted leaf-out dates averaged across sites and leaf-out dates monitored at each site. R ² values of linear regressions are shown at the top of each panel, sample sizes are shown below. Beijing, Beijing Botanical Garden, China; Berlin, Botanic Garden and Botanical Museum Berlin-Dahlem, Germany; Boston, Arnold Arboretum, MA, USA; Framingham, Garden in the Woods, MA, USA; Lisle, Morton Arboretum, IL, USA; Munich, Munich Botanical Garden, Germany; Ottawa, Ottawa Arboretum, Canada; and Washington, US National Arboretum, DC and Beltsville, MD, USA. Data from Panchen et al. (2014)