Kalmar “genus” tana nufin matsayi na harajin da ake amfani da shi wajen rarraba rayayyun halittu, tare da tara nau’ukan da ke raba wasu halaye. wanda aka fi sani da zinariyathread. Tsire-tsire a cikin wannan nau'in tsire-tsire ne masu tsire-tsire masu tsire-tsire waɗanda suke asalin Asiya da Arewacin Amurka, kuma an san su da zaren rawaya-kamar tushensu da ƙananan furanni, fari ko rawaya. Halin halittar Coptis ya ƙunshi nau'ikan nau'ikan nau'ikan 15-20, kuma ana amfani da wasu a cikin maganin gargajiya don maganin su.