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": ""}
 Rx  1318163         851 _ui     AT EDGE OF CULTIVATED FIELD.           SAA SALICACEAE     FS3 near center point of west boundary East side of Boyer Rod., 0.5 mi south of intersection with Hwy. M-43 (Grand Ledge Hwy.). Marshall    1981-05-23  UC D  
{"catalogNumber": "1318163", "order": "", "family": "Salicaceae", "scientificName": "", "scientificNameAuthorship": "Marshall", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "851", "verbatimEventDate": "1981-05-23", "habitat": "At edge of cultivated field.", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "", "municipality": "", "locality": "near center point of west boundary East side of Boyer Rod., 0.5 mi south of intersection with Hwy. M-43 (Grand Ledge Hwy.).", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}