Cyperus tetragonus Elliott. Four-angled Flatsedge. Phen: Jul-Sep. Hab: Maritime forests and dunes, edges of brackish marshes. Dist: E. NC south to s. FL and FL Panhandle. Reports of the species in s. AL (Woods, Diamond, & Burkhalter 2016) are based on specimens of C. thyrsiflorus.

ID notes: This species is easy to recognize in the field by its narrowly and very loosely cylindric spikes with relatively short, ellipsoid spikelets.

Origin/Endemic status: Endemic

Taxonomy Comments: C. pringlei of AZ, NM, and n. Mexico has sometimes been treated as conspecific (as by FNA), but it should be regarded as distinct or as a synonym of C. mutisii .

Synonymy: = K4, RAB, S; < Cyperus tetragonus Elliott – FNA23, K1, K3, WH3

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