Fig. 1: Glasshouse plant morphology and its evolution in Rheum.

a Representatives of glasshouse plants. A–C: Rheum nobile, R. alexandrae var. 1 and R. alexandrae var. 2 (Polygonaceae). D, E: Ajuga lupulina var. lupulina and A. lupulina var. major (Lamiaceae). F–G: Saussurea obvallata, S. involucrata and S. velutina (Asteraceae). b Phylogeny of Rheum estimated from 132 orthologs using coalescent method with local posterior probabilities shown in node. The glasshouse lineages are labeled in red. Node bars represent 95% highest posterior densities (HPD) of divergence time estimated using MCMCTree.