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": ""}
     7871 0     SANDY ROADSIDE  M=    R. L. Wilbur W    wT POACEAE     Paspalum silK  MICHX.  Wh  Chatham U(f     O- 1419663 floridanum B$]-   US501, 6 mils south of Pittsboro P1#    v<C 1968-08-17
{"catalogNumber": "1419663", "order": "", "family": "Poaceae", "scientificName": "", "scientificNameAuthorship": "Michx.", "genus": "Paspalum", "subgenus": "", "specificEpithet": "floridanum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "R. L. Wilbur", "recordedBy": "", "recordNumber": "7871", "verbatimEventDate": "1968-08-17", "habitat": "Sandy roadside", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "Chatham", "municipality": "", "locality": "US501, 6 miles south of Pittsboro", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}