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": ""}
  E _ united states  gP@ poales  o@ (COULT.) NASH   148-08-25 =< XP   _ BROMUS PORTERI      Botanical Gardens, University of Michi_gan, Ann Arbor         AC^i~ h. keith wagnon porteri +  6   washtenaw Y)C   % 147758   (~~Z Bromus  
{"catalogNumber": "1407758", "order": "Poales", "family": "", "scientificName": "Bromus porteri", "scientificNameAuthorship": "(Coult.) Nash", "genus": "Bromus", "subgenus": "", "specificEpithet": "porteri", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "H. Keith Wagnon", "recordNumber": "", "verbatimEventDate": "1948-08-25", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "United States", "stateProvince": "", "county": "Washtenaw", "municipality": "", "locality": "Botanical Gardens, University of Michigan, Ann Arbor", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}