Data mode


Sign up

Copy permalink to share

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

Show in key(s)

Show parent genus

Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FAC
  • Great Plains: FAC

Heliophily ?: 7

Your browser does not support SVGs

Hover over a shape, letter, icon, or arrow on the map for definition or see the legend.

image of plant© Bruce A. Sorrie | Original Image ⭷
image of plant© Keith Bradley | Original Image ⭷


See something wrong or missing on about Cyperus tetragonus? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.) We greatly appreciate feedback, and will include updates from you in our next webapp update, which can take a few months.

Cite as...