Ragweeds are monoecious, most producing inflorescences that contain both staminate and pistillate flowers. The species is monoecious, with plants bearing inflorescences containing both pistillate and staminate flowers. Sterile stamens are often present, both in pistillate and staminate flowers. Its inflorescence is yellow with staminate and pistillate headson a single plant (monoecious). The cyathium contains minute staminate and pistillate flowers lacking petals. Cherrybark oak is monoecious; staminate and pistillate catkins are borne separately on the same tree. This species is dioecious (pistillate and staminate flowers occur on separate plants). The scale-like motile staminodes sandwiched by pistillate and staminate flower zones are called interstice staminodes. Both staminate and pistillate heads are long. Almost all "Carex" species are monoecious; each flower is either male (staminate) or female (pistillate). There are no ray flowers, but many disk flowers which are either staminate or pistillate. In which case they may be either male (staminate) or female (pistillate). The staminate inflorescence is a catkin up to long with fuzzy male flowers. Ronse De Craene utilizes the words "pistillate" or "staminate" instead of the symbols. At any one time, a dioecious plant produces only functionally staminate or functionally carpellate flowers.