Refactor the unstructured text into a valid JSON dictionary. The key names follow the Darwin Core Archive Standard. If a key lacks content, then insert an empty string. Fill in the following JSON structure as required: {"catalogNumber": "", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}
nigromarginata K.<2K     Schwein. CM  arkansas W    l3k4L Polk     t.t, Jeff H.Rettig   1986-04-15 E1    Poales Gig   .Q Ouachita Nat. Forest, along FSR 3 to Shady Lake, 3.2 mi north of its jct w6ith Hwy 246, north of Athens & 0.35 mi S of entrance road to Shady Lake Rec.   n Carex   1380549 @P    
{"catalogNumber": "1380549", "order": "Poales", "family": "", "scientificName": "", "scientificNameAuthorship": "Schwein.", "genus": "Carex", "subgenus": "", "specificEpithet": "nigromarginata", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Jeff H. Rettig", "recordNumber": "", "verbatimEventDate": "1986-04-15", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Arkansas", "county": "Polk", "municipality": "", "locality": "Ouachita Nat. Forest, along FSR 38 to Shady Lake, 3.2 mi north of its jct with Hwy 246, north of Athens & 0.35 mi S of entrance road to Shady Lake Rec.", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}