Floral morphology plays a fundamental role in shaping plant–pollinator interactions by influencing pollinator attraction, handling behavior, and the efficiency of pollen transfer. Variation in floral traits such as corolla shape and size, symmetry, color, scent, nectar accessibility, and anther–stigma positioning reflects evolutionary responses to selective pressures imposed by different pollinator functional groups. This review synthesizes empirical, experimental, and theoretical studies published up to December 2025 to examine how floral morphology regulates pollination efficiency across major plant functional groups, including generalized open-flowered species, tubular bird- and moth-pollinated plants, poricidal buzz-pollinated taxa, zygomorphic bee-pollinated systems, and functionally contrasting wind-pollinated plants. Emphasis is placed on mechanistic pathways linking morphology to pollination outcomes, particularly mechanical fit between floral structures and pollinator bodies, reward accessibility and handling constraints, and pollen presentation strategies that influence pollen removal and deposition.