Cover illustration: The inset cover illustration shows diagrammes of correlated evolution between pollination syndromes and floral symmetry in Balsaminaceae (including the species rich genus Impatiens). Phylogenetic relationships among the species were used to quantify the number of shifts in pollination syndromes (bees, birds, bimodal or autogamy) and the number of times floral asymmetry has evolved. Pollinator shifts are more frequent, and the evolution of asymmetrical corollas typically occurs in ancestrally bee-pollinated species, presumably because bee bodies are particularly suitable for precise pollen placement on different parts. (See Ruchisansakun et al. pp. 267–280).