The IUCN extinction risk assessment metrics were exported from IUCN’s SIS (64) and used as the basis for mapping and statistical analysis. To map coffee species at the country level, species data from the World Checklist of Selected Plant families (67) were matched to Taxonomic Databases Working Group (TDWG) geographical scheme level 3 geography (68). TDWG level 3 denotes a “botanical country,” where most regions are subdivided into units generally equating to a political country, but large countries may be split or outlying areas omitted. These outputs provided species totals and percentages against extinction risk assessment category (CR, EN, VU, NT, LC, and DD) for each country. Data were displayed in ArcGIS 10.5 (69) using the Winkel I projection orientated around the 45° east meridian (through Madagascar). The map colors for Fig. 1 and figs. S1 and S2 were derived from ColorBrewer version 2 (70) to highlight color representation (i.e., allow for differentiation of classes and reproducibility in print and online).

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