Marrubium sivasense Aytaç, Akgül & Ekici sp. nova (Lamiaceae) is described and illustrated from Central Anatolia, Turkey. Th e new species most resembles Marrubium depauperatum, but it diff ers by 3-10 fl owered verticillasters, crenate to crenulated leaf margins, and unequal calyx teeth. Th e ecology and phenology of the new species as well as its etymology, conservation status, and diagnostic features are discussed.
