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": ""}
           pr Betty M. Robertson       X united states     pPXOk Saginaw    Zqx [Pistillate material. Act ive barcode, on same sheet with staminate material of S. bebbiana with inactive barcode 1474828]  g salix    f3XSG Along railroad embankment in depression 3 mi. N. of St. Charles. 
{"catalogNumber": "", "order": "", "family": "", "scientificName": "", "scientificNameAuthorship": "", "genus": "Salix", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Betty M. Robertson", "recordNumber": "", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "[Pistillate material. Active barcode, on same sheet with staminate material of S. bebbiana with inactive barcode 1474828]", "associatedTaxa": "", "country": "United States", "stateProvince": "", "county": "Saginaw", "municipality": "", "locality": "Along railroad embankment in depression 3 mi. N. of St. Charles.", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}