Kalmar "genus" tana nufin nau'in harajin da ake amfani da shi a cikin ilimin halitta don rarraba rayayyun halittu. Musamman ma, matakin rarrabuwa ne sama da nau'in jinsi da ƙasa da iyali."Mentzelia" shine sunan jinsin tsire-tsire waɗanda ke cikin dangin Loasaceae. Ana samun waɗannan tsire-tsire a Arewacin Amirka da Kudancin Amirka, kuma an san su da furanni masu ban sha'awa da masu tushe da ganye. nau'in tsiro da ke cikin zuriyar Mentzelia.