Figure 6 from: Steeman R, Vanreusel W, Barendse R, Verloove F, Wysmantel N, Van den Bussche W, Gyselinck T, Hendrickx P, Zwaenepoel A, Van Vooren P, Jacobs S, Desmet P, Gielen K, Herremans M, Swinnen K, all plant working groups and plant observers (2017) Waarnemingen.be – Plant occurrences in Flanders and the Brussels Capital Region, Belgium. PhytoKeys 85: 1-10. https://doi.org/10.3897/phytokeys.85.14925

Figure 6 - Number of collected records between 1855 and 2000 (left) and between 2001 and 2016 (right). Each number on the left x-axis is a period of 10 year (e.g., 1910 = 1901–1910, etc.). Note the difference between the scales on the y-axis between the left and right figures and the strong increase in smartphone registration of records since the launch of an app (ObsMapp for Android) in 2012.