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New York, s. Ohio, s. Illinois, and e. Texas, the northern extent of the native range uncertain. Reported for s. Indiana (Clark County) by Namestnik, Pilla, & Thomas (2025).","graphic_key_source_attributes":{"Attr0":"gr04","Attr1":"nc_cp,nc_mt,nc_pd,sc_cp,sc_mt,sc_pd,ga_cp,ga_pd,","Attr10":"4H23,4H43","Attr11":"b","Attr12":"4Bw2,4Bw4","Attr2":"Dry,Moist","Attr3":"Sun","Attr3a":"y","Attr3a_subregion":"native_nc_cp:y,native_nc_mt:y,native_nc_pd:y,native_sc_cp:y,native_sc_mt:y,native_sc_pd:y,native_ga_cp:y,native_ga_pd:y,","Attr4":" 6-10","Attr5":"n","Attr6":"n","Attr7":"n","Attr8":"r,t","Attr9":"n"},"habitat_description":"Sandy fields, disturbed areas.","habitat_light_categories":["Full sun"],"habitat_moisture_categories":["Dry","Moist"],"heliophily_index":9,"identification_notes":"Occasionally mistaken for a member of subgenus Pycreus . The dark black, obviously trigonous achenes and mucronate scales distinguish it easily under a hand lens.","phenology_source_text":"Jul-Sep.","regional_wetland_indicators":[{"source_column":"WetlandStatus1","value":"FACW"},{"source_column":"WetlandStatus2","value":"FACW"},{"source_column":"WetlandStatus3","value":"FACW"},{"source_column":"WetlandStatus4","value":"FAC"},{"source_column":"WetlandStatus5","value":"FACW"}],"taxonomic_synonymy":"[= Ar, Bah, C, ETx1, F, FNA23, G, GW1, Il, K1, K4, Mex, Mo1, NcTx, NS, NY, Pa, POWO, RAB, S, Tat, Tn, Tx, Va, W, WH3]"}},"usda":{"matched_name":"Cyperus compressus","retrieved":"2026-09-24","scope":"Nationwide species characteristics; local growing conditions may vary","source_label":"USDA PLANTS","source_url":"https://plants.usda.gov/","usda_id":18551,"values":{"bloom_season":"Late Summer","flower_color":"Green","foliage_color":"Green","fruit_season_begin":"Fall","fruit_season_end":"Fall","growth_architecture":"Bunch","growth_rate":"Rapid","height_ft":1,"leaf_retention":"No"}}},"light_range":["full sun","full sun"],"light_source":"Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition","native_synthesis":{"claims":[{"basis":"atlas map status: introduced (status code 1) or native","claim":"introduced","matched_name":"Cyperus compressus","scope":"AR","source":"ar_atlas_2013","url":"https://biology.uark.edu/herbarium/AtlasVascularPlantsArkansas2013_lowerres.pdf#page=440"},{"claim":"native","matched_name":"Cyperus compressus","scope":"L48","source":"usda","text":"HI:I L48:N PB:I PR:N VI:N","url":"https://plants.usda.gov/"},{"claim":"native","matched_name":"Cyperus compressus","scope":"NC","source":"nc_flora","url":"https://auth1.dpr.ncparks.gov/flora/"},{"basis":"species account without the alien asterisk","claim":"native_distribution","matched_name":"Cyperus compressus","scope":"AL-AR-DC-DE-FL-GA-KY-LA-MD-MS-NC-NJ-PA-SC-TN-VA-WV","source":"weakley_fsus","url":"https://fsus.ncbg.unc.edu/"}],"county_native_range":"unresolved","decided_by":"ar_atlas_2013","explanation":"Atlas of the Vascular Plants of Arkansas (2013) (published flora, state claim) gives the value, over a broader claim from a higher tier. 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