Botanical bristles are a type of plant structure that are composed of stiff, sharp hairs. Setae (5 letters) are the most common type of botanical bristle and are found on the leaves and stems of many plants. Arista (7 letters) are another type of botanical bristle that are found on the seeds of some grasses. AWNS (4 letters) are the longest type of botanical bristle and are found on the seeds of some grasses and other plants. All three types of botanical bristles are important for the protection and dispersal of plant species.