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": ""}
   WILLIAM W. CALKINS      U5kb spiranthes cernua    r 1876-08-25  J1J: (L.) Rich.        United States  u  illinois   C SPIRATHES ORCHIDACEAE zg~   ASPARAGALES r6     . CERNUA JASPER Ed Z  
{"catalogNumber": "", "order": "Asparagales", "family": "Orchidaceae", "scientificName": "Spiranthes cernua", "scientificNameAuthorship": "(L.) Rich.", "genus": "Spiranthes", "subgenus": "", "specificEpithet": "cernua", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "William W. Calkins", "recordNumber": "", "verbatimEventDate": "1876-08-25", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Illinois", "county": "Jasper", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}