Cyperus retrofractus, an umbrella sedge from the southeastern United States

Cyperus retrofractus.  A. Plant base.  B. Inflorescence, stem pubescence, and stem transverse section.  C. Primary prophyll.  D. (Right) spikelet, lateral aspect, intact; (left) proximal floral scale removed to show relationship of rachilla wing and achene.  E. Anther.