Plant bristles, also known as setae (5 letters) and AWNS (4 letters), are small, stiff hairs that grow on the surface of plants. They are typically found on the leaves, stems, and fruits of plants, and serve a variety of purposes, such as providing protection from predators, helping to retain moisture, and aiding in the dispersal of seeds. Setae are usually longer and thicker than AWNS, and can be either straight or curved. AWNS are usually shorter and thinner than setae, and are often curved or hooked. Both setae and AWNS are important features of many plant species.