Figure 1 - General view of the leaf blade of the small-leaved linden (a) and four dimensional features (b):

1 – distance between the bases of the 1st vein of the 1st order and the 2nd vein of the 2nd order; 2 – distance between the bases of the 2nd and 3rd veins of the 2nd order; 3 – distance between the bases of the 1st and 2nd veins of the 1st order; 4 – distance between the beginning of the 2nd vein of the 2nd order and the 2nd vein of the 1st order