Fig. 3From: Evolution of flower allometry and pigmentation in Mammillaria haageana (Cactaceae)Tepal shape and size is described by at least six Principal Components (PCS). The deviations from the mean shape (black outline) are represented in blue (− 2 standard deviations) or in red (+ 2 standard deviations). The percentage of explained variance is shown, together with our description of the corresponding PCS trendBack to article page