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": ""}
   vx Echinochloa    `  north carolina  QB3#A poUaceae     q 7866    = united states WALTER rT /     E 1411690  F^ (PURSH) A. HELLER  gv[l POALES  ^H 1968-08-16   echinochloa walteri 7l    Aaa, Contact UM Herbarium tyrrell r8  
{"catalogNumber": "1411690", "order": "Poales", "family": "Poaceae", "scientificName": "Echinochloa walteri", "scientificNameAuthorship": "(Pursh) A. Heller", "genus": "Echinochloa", "subgenus": "", "specificEpithet": "walteri", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "7866", "verbatimEventDate": "1968-08-16", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "North Carolina", "county": "Tyrrell", "municipality": "", "locality": "Contact UM Herbarium", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}