Cyperus obtusatus is a perennial sedge found in wet habitats of the southeastern US. It has triangular stems, basal leaves, and spikelets arranged in a terminal.
Above information is sourced from Wikipedia
© Nils Servientis - Bivouac Naturaliste (CC-BY-NC)
© (c) Seba Fernández, some rights reserved (CC BY)
© GBIF − Luís A. Funez (iNaturalist) − Global Biodiversity Information Facility