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": ""}
  P exigua    *l&aL salix exigua  3h Nutt.   n~$a salicaceae   h  -86.811009 west of scott's falls on m 28. + xVp   L<V Alger   M<XUd 3253 Salix HUI           mMtcU Charles D. Richards   rF "SHRUB 6 FT. TALL." 
{"catalogNumber": "", "order": "", "family": "Salicaceae", "scientificName": "Salix exigua", "scientificNameAuthorship": "Nutt.", "genus": "Salix", "subgenus": "", "specificEpithet": "exigua", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Charles D. Richards", "recordNumber": "3253", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "\"Shrub 6 ft. tall.\"", "associatedTaxa": "", "country": "", "stateProvince": "", "county": "Alger", "municipality": "", "locality": "West of Scott's Falls on M 28.", "decimalLatitude": "", "decimalLongitude": "-86.811009", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}