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. The cyathium contains minute staminate and pistillate flowers lacking petals. 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 scale-like motile staminodes sandwiched by pistillate and staminate flower zones are called interstice staminodes. This species is dioecious (pistillate and staminate flowers occur on separate plants). 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). Two stamen are longer and stamens of pistillate flowers are rudimentary. Ronse De Craene utilizes the words "pistillate" or "staminate" instead of the symbols. The catkins usually emerge before the pistillate flowers. This mechanism has only been observed in pistillate plants for dioecious C. arvense.