Kalmar "Genus Rosa" tana nufin rabe-raben kimiyya na wardi, waɗanda rukuni ne na tsire-tsire masu furanni na perennial a cikin dangin Rosaceae. Halin halittar Rosa ya ƙunshi fiye da nau'in ciyayi 100 na shrubs da masu hawan dutse, waɗanda galibi ana siffanta su da ƙayayuwa mai tushe, ganyen fure, da furanni masu ban sha'awa tare da furanni biyar a cikin inuwar ruwan hoda, ja, rawaya, ko fari. Rarraba wardi da ke ƙarƙashin jinsin Rosa ya dogara ne akan halayensu na zahiri da na halitta, kuma masana ilmin halitta da masu aikin lambu suna amfani da shi wajen rarraba da kuma nazarin waɗannan tsire-tsire.