Blueweed is a common name for the Centaurea cyanus plant, characterized by its blue-purple flowers. However, there are several synonyms for this plant, including Bachelor's button, basket flower, bluebonnet, cornflower, and ragged robin. These names often vary based on the location and cultural background of the speaker. For instance, in Australia, blueweed is sometimes referred to as "hurt sickpea" due to its toxicity to livestock. In traditional medicine, blueweed has been used to treat various ailments such as digestive issues, fever, and respiratory problems. Despite its enticing blue blooms, blueweed is often considered a weed due to its invasive nature in gardens and lawns.