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": ""}
 YS_ 240  Q x Virginia   ON THE POTOMAC RIVER AT CHAIN BRIDGE `   > 1419204   4 Panicum virgatum   Poales F    L. ASl  1935-07-27 F>        %5x united stfates  ARLINGTON  hC+   virgatum  ]d;   )Aa anicum  POACEAE l1yW= 
{"catalogNumber": "1419204", "order": "Poales", "family": "Poaceae", "scientificName": "Panicum virgatum", "scientificNameAuthorship": "L.", "genus": "Panicum", "subgenus": "", "specificEpithet": "virgatum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "240", "verbatimEventDate": "1935-07-27", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Virginia", "county": "Arlington", "municipality": "", "locality": "on the Potomac River at Chain Bridge", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}