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": ""}
 ~~ POTOMAC RIVER  xkC> s.n. AQUATICUM z   r l.      9 mL washington, d.c.  g alismatales  Nlec united states      e  r orontium aquaticum  V~  1489629      ],] araceae ORONTIUM 4CE?l  SCHOTT x-B   l SWAMPS  1857-05-08 U?  
{"catalogNumber": "1489629", "order": "Alismatales", "family": "Araceae", "scientificName": "Orontium aquaticum", "scientificNameAuthorship": "L.", "genus": "Orontium", "subgenus": "", "specificEpithet": "aquaticum", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Schott", "recordNumber": "s.n.", "verbatimEventDate": "1857-05-08", "habitat": "Swamps", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "Washington, D.C.", "county": "", "municipality": "", "locality": "Potomac River", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}