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": ""}
  503 R^B      zCg michigan  8 IOSCO    2  5m CONYZA  & -83.3585      65s (L.) Cronquist  X)/  asteraceae          m  canadensis
{"catalogNumber": "", "order": "", "family": "Asteraceae", "scientificName": "", "scientificNameAuthorship": "(L.) Cronquist", "genus": "Conyza", "subgenus": "", "specificEpithet": "canadensis", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "503", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Michigan", "county": "Iosco", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "-83.3585", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}