Fig. 6

Seed surface area (average and standard deviation; square millimeter) for the four species revealing significant differences in germination ratios between the provenances (number of mother plants: C. ladanifer, north = 10, center = 10, south = 10; E. australis and G. triacanthos, north = 10, center = 9, south = 10; P. tridentatum, north = 5, south = 10). Different letters indicate significant differences between provenances, at α = 0.05, using Student’s t test for P. tridentatum and Tukey’s test for E. australis and G. triacanthos (after ln (x + 1) transformation); n.a. indicates that no data existed for the respective provenance