Cyperus brevifolioides

Cyperus brevifolioides Thieret & Delahouss., Sida 3: 129 (1967) (syn: Cyperus brevifolius var. gracillimus (Miq.) Kük.; Cyperus brevifolius var. leiolepis (Franch. & Sav.) T.Koyama ; Cyperus brevifolius subsp. leiolepis (Franch. & Sav.) T.Koyama ; Kyllinga brevifolia var. gracillima (Miq.) Kük.; Kyllinga brevifolia var. leiocarpa Kitag. ; Kyllinga brevifolia subsp. leiolepis (Franch. & Sav.) T.Koyama ; Kyllinga brevifolia var. leiolepis (Franch. & Sav.) H.Hara ; Kyllinga brevifolioides (Thieret & Delahouss.) G.C.Tucker ; Kyllinga gracillima Miq.; Kyllinga monocephala var. leiolepis Franch. & Sav.);
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Central Himalaya to Japan: China North-Central, China South-Central, China Southeast, East Himalaya, Japan, Korea, Manchuria, Nansei-shoto, Nepal, Primorye; Introduced into: Alabama, Arkansas, Connecticut, Delaware, Georgia, Indiana, Italy, Kansas, Kentucky, Maryland, Mississippi, New Jersey, New York, North Carolina, Pennsylvania, Tennessee, Transcaucasus, Virginia as per POWO;
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Cyperus brevifolioides Thieret & Delahouss.: 5 high res. images.

This is identified by. Dr. Prabin Bhandari.

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References:
POWO  iNaturalist  Flora of the Southeastern United States