A cewar ƙamus na Turanci na Oxford, Centaurea imperialis wani nau'in shuka ne na fure a cikin dangin Asteraceae, ɗan asalin Caucasus da Iran. An san shi da sunan knapweed na sarki ko rawaya-star-thistle. An siffanta tsiron da tsayinsa, mai reshe, manyan furanni masu launin rawaya, da ganyen kaɗa.
