Extended Data Fig. 1: Box and whisker plots for length and width of leaves and seeds, parchment (endocarp) thickness, and elevation for C. liberica (Liberica), C. dewevrei (excelsa) and C. klainei.

Mean values in square brackets; quartile values are given in Supplementary Information Table 2. a, Leaf length (cm): C. liberica (22. 8 cm), C. dewevrei (29.5 cm) and C. klainei (23.9 cm). b, Leaf width (cm): C. liberica (8.2 cm), C. dewevrei (14 cm) and C. klainei (8.7 cm). c, Seed length (mm): C. liberica (12.6 mm) and C. dewevrei (9.3 mm). d, seed width (mm): C. liberica (8.4 mm), C. dewevrei (6.6 mm). e, Parchment thickness (mm): C. liberica (0.57 mm) and C. dewevrei (0.31 mm). f, Elevation (m): C. liberica (386 m), C. dewevrei (654 m) and C. klainei (274 m). Overview of t-Tests: C. liberica and C. dewevrei are significantly different (p < 0.0005) for all six variables; C. liberica and C. klainei are not significantly different for any variables; C. dewevrei and C. klainei are significantly different for leaf length and width (p < 0.0005) and elevation (p < 0.005). t-Test results and other information are given in Supplementary Information Table 2.