Phylogenetic relationships inferred by ML and BI analyses of the 114 samples belonging to <i>Hormathophylla</i>, based on the ribosomal sequence ITS1-5.8S-ITS2, shown as a majority rule consensus tree.

Posterior probability and bootstrap support values are shown above and below the branches. Trichome types, as described in S5 Table, across different species are coded as T1, T2, T3, and T4. Basic chromosome number (x) is indicated by colored bars. Substrate type of the populations where sequences come from are coded as follows: D: dolomite; G: gypsum; L: limestone; S: serpentine; Si: siliceous.