Figure 2 from: Brosens D, Van Landuyt W, Vanhecke L (2012) Florabank1: a grid-based database on vascular plant distribution in the northern part of Belgium (Flanders and the Brussels Capital region). PhytoKeys 12: 59-67. https://doi.org/10.3897/phytokeys.12.2849

Figure 2 - Number of prospected 1 km? grids in each grid of 4?4 km for the period 1939–1971. A 1 km? grid cell is considered as prospected if at least 90 species have been recorded.