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": ""}
18720 t~$     GROENLANDICUM !;5    KATHLEEN A. KRO N e-on    C Contact UM Herbarium  1979-06-21 fJ] R   Rhododendron groenlandicum D/     HN  THUNDER BAY  G ericales    CLAUD E. GARTON L/       L 1241097 ontario G 
{"catalogNumber": "1241097", "order": "Ericales", "family": "", "scientificName": "Rhododendron groenlandicum", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "groenlandicum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "Kathleen A. Kron", "recordedBy": "Claude E. Garton", "recordNumber": "18720", "verbatimEventDate": "1979-06-21", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Ontario", "county": "Thunder Bay", "municipality": "", "locality": "Contact UM Herbarium", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}