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": ""}
 1910-08-23       POTAMOGETON EPIHYDRUS VAR. NUTTALLII 2d81x    C_ potamogeton    H&: VAR. E.C. Ogden G4K   !^L Potamog/etonaceae 48.09957  g  epihydrus fHh,   Ali5matales      6# Keweenaw  ISLE ROYALE, MCCARGOE COVE 4   1514511 [OQ.  -88.696437 +RH:R   ;[>h nuttallii United States %    MICHIGAN C 
{"catalogNumber": "1514511", "order": "Alismatales", "family": "Potamogetonaceae", "scientificName": "Potamogeton epihydrus var. nuttallii", "scientificNameAuthorship": "", "genus": "Potamogeton", "subgenus": "", "specificEpithet": "epihydrus", "verbatimTaxonRank": "var.", "infraspecificEpithet": "nuttallii", "identifiedBy": "E.C. Ogden", "recordedBy": "", "recordNumber": "", "verbatimEventDate": "1910-08-23", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Keweenaw", "municipality": "", "locality": "Isle Royale, McCargoe Cove", "decimalLatitude": "48.09957", "decimalLongitude": "-88.696437", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}