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": ""}
    aalk  sagittaria  @$yW  CRISTATA      c [sterile rosettes of stiff blades as in this sp., plus two presumably emersed phyllodia] 7229 GQu  1 1/2 miles n. w. homestead =Q   nD$ 46.358725  in 2 in. water, sandy bottom of lake george x8  alismatales H 9ZM   c. barre hellquist J`  1935-09-08     [7 Chippewa    `F3a ENGELM.  UNITED STATES  X l=  sagittaria cristata  ra  
{"catalogNumber": "", "order": "Alismatales", "family": "", "scientificName": "Sagittaria cristata", "scientificNameAuthorship": "Engelm.", "genus": "Sagittaria", "subgenus": "", "specificEpithet": "cristata", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "C. Barre Hellquist", "recordedBy": "", "recordNumber": "7229", "verbatimEventDate": "1935-09-08", "habitat": "In 2 in. water, sandy bottom of Lake George", "occurrenceRemarks": "[sterile rosettes of stiff blades as in this sp., plus two presumably emersed phyllodia]", "associatedTaxa": "", "country": "United States", "stateProvince": "", "county": "Chippewa", "municipality": "", "locality": "1 1/2 miles N. W. Homestead", "decimalLatitude": "46.358725", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}