Kalmar "Genus" tana nufin matsayi na haraji da aka yi amfani da shi a cikin rarrabuwar halittu wanda ƙungiyoyin jinsuna suke da alaƙa tare. "Empetrum" wani nau'in tsire-tsire ne na furanni a cikin gidan Ericaceae, wanda aka fi sani da crowberries. Halin halittar ya ƙunshi kusan nau'ikan ciyayi 10 na tsire-tsire masu tsire-tsire waɗanda ake samun su a cikin yanayin sanyi da yankunan da ke ƙarƙashin ƙasa na Arewacin Hemisphere.