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": ""}
    6 16750         sub-aquatic plant. in water up to 3 feet deep N        1702306 :x1   SCHWEINFURTHII ) m=   CONTACT UM HERBARIUM t  `    nr/ & mwanza   ._ POTAMOGETON SCHWEINFURTHII  i@ fC potamogetonaceae
{"catalogNumber": "1702306", "order": "", "family": "Potamogetonaceae", "scientificName": "Potamogeton schweinfurthii", "scientificNameAuthorship": "", "genus": "", "subgenus": "", "specificEpithet": "schweinfurthii", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "1650", "verbatimEventDate": "", "habitat": "Sub-aquatic plant. In water up to 3 feet deep", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "Mwanza", "county": "", "municipality": "", "locality": "Contact UM Herbarium", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}