Kalmar “genus” tana nufin matsayi na haraji da aka yi amfani da shi a cikin ilmin halitta don rarraba kwayoyin halitta. Halittar halitta rukuni ne na nau'ikan nau'ikan da ke da alaƙa da ke da halaye iri ɗaya da kuma kakannin juyin halitta.Sideritis shine jinsin tsire-tsire masu furanni a cikin dangin Lamiaceae. Tsire-tsire a cikin wannan jinsin ana kiran su da ironworts ko dutsen teas, kuma asalinsu ne a yankin Bahar Rum. Halin ya ƙunshi kusan nau'ikan 150 na herbaceous perennials, shrubs, da subshrubs. Yawancin nau'in nau'in Sideritis an yi amfani da su a maganin gargajiya don magance cututtuka iri-iri, wasu kuma an yi amfani da su azaman shayi na ganye.