Diversity in leaf forms across land plants. (A) Selected representatives of the different types of leaf forms found in non-vascular and vascular model plant species viz. Physcomitrella patens (non-vascular), Selaginella kraussiana (microphyll), Arabidopsis thaliana (simple megaphyll), and Solanum lycopersicum (compound megaphyll). (B) Selected representatives of uncommon and innovative leaf morphology found in vascular non-model plant species viz. Christia obcordata (butterfly-shaped leaf), Nepenthes khasiana, and Monstera deliciosa (modified leaf). Contributors of photographs used in the figure can be found in the Acknowledgements section.