Classification tree analysis of the Carpobrotus genetic clusters based on morphological characteristics. The most significant characteristic is indicated at each node, with the corresponding values relating to branches on the left. Morphological differences between genetic clusters could be best explained by the color of the filaments of the stamens (Stamen_c), the flower diameter (Flower_d), the position of the calyx globes (CG), the ovary surface (Ovary), the leaf cross section area (Triangle), the leaf length (Leaf_len) and the diameter of the stamen ring (SR). Leaf_len, Flower_d and SR are indicated in cm. Colours of circles at the end of branches correspond to the genetic clusters. n = number of individuals assigned to each cluster. See Fig. 2 for details on the morphological characteristics included in the analysis.