Not a mouth but a gate, the snapdragon's flower yields when a bumblebee brings enough weight to its lower lip. No welcome is intended. The fused petals form a bilabiate corolla, whose palate seals the floral throat until a heavy visitor depresses it; smaller insects often cannot force entry, and many nectar thieves are left outside. Thus is access priced. Inside, nectar waits at the base, while an...More