P. flavescens may refer to:
Pantala flavescens, the most widespread dragonfly Pappophorum flavescens, a pappus grass Paracles flavescens, a Brazilian moth Paraclione flavescens, a sea angel Paradelphomyia flavescens, a crane fly Parapercis flavescens, a bony fish Paraxanthias flavescens, a mud crab Parazuphium flavescens, a ground beetle Parsonsia flavescens, a woody vine Pelias flavescens, a venomous viper Penstemon flavescens, a flowering plant Pentanychus flavescens, a daddy longlegs Peperomia flavescens, a radiator plant Perca flavescens, a freshwater fish Pergularia flavescens, a perennial herb Perognathus flavescens, a North American rodent Peyssonnelia flavescens, a red algae Peziza flavescens, an apothecial fungus Phalera flavescens, an Asian moth Phaseolus flavescens, a wild bean Phiale flavescens, a jumping spider Phoradendron flavescens, a mistletoe native to the Americas Phragmatobia flavescens, a South American moth Phryneta flavescens, a flat-faced longhorn beetle Pipistrellus flavescens, a vesper bat Plagiometriona flavescens, a leaf beetle Plastingia flavescens, a skipper butterfly Pleiocarpa flavescens, a plant with fragrant flowers Plexippoides flavescens, a jumping spider Plutodes flavescens, a geometer moth Poecilopeplus flavescens, a longhorn beetle Pogonognathellus flavescens, a hexapod with internal mouthparts Procanace flavescens, a beach fly Promalactis flavescens, a Chinese moth Psaltoda flavescens, a cicada native to Queensland Pseudauchenipterus flavescens, a driftwood catfish Pseudomonas flavescens, a Gram-negative bacterium Psilopa flavescens, a shore fly Pterandra flavescens, a flowering plant Puccinia flavescens, a plant pathogen Pulvinaria flavescens, a scale insect Pycnonotus flavescens, an Asian songbird Pycreus flavescens, a papyrus sedge