Spatial partitioning of floral volatiles provides a "chemosensory roadmap" for bumblebee pollinators.

How do plants with structurally complex flowers promote effective pollination? From the pollinator's perspective, complex flowers can be reimagined as mechanical puzzles that require the manipulation of a 3D object in search of a concealed reward. The spatial partitioning of volatile organic compounds (VOCs) within flowers may help flower-naive pollinators to successfully complete such puzzles, thereby increasing their foraging proficiency and, from the plant's perspective, promoting flower constancy and pollination efficiency. Here, we construct "chemosensory roadmaps" for Impatiens capensis and I.