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": ""}
 [/ Spirodela polyrhiza    ] (L.) Schleid. west of circle near letot X   19306 n   TEXAS =   shade. plants floating e  GRAVEL PIT POND A]%p;   ]_gu UNITED STATES  araceae *//A  1663031 m9$   =U  eula whitehouse       cc Yx Alismatale   dallas vDp   1947-10-15 u- 
{"catalogNumber": "1663031", "order": "Alismatales", "family": "Araceae", "scientificName": "Spirodela polyrhiza", "scientificNameAuthorship": "(L.) Schleid.", "genus": "", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Eula Whitehouse", "recordNumber": "19306", "verbatimEventDate": "1947-10-15", "habitat": "Gravel pit pond", "occurrenceRemarks": "Shade. Plants floating", "associatedTaxa": "", "country": "United States", "stateProvince": "Texas", "county": "Dallas", "municipality": "", "locality": "West of circle near Letot", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}