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": ""}
   po aceae AR   c: 1941-04-13   o  2684       ZE bromus  WH Y CONTACT UM HERBARIUM 1407396 on^1r    $H ( CALIFORNIA      e santa clara  = HORDEACEU5  BROMUS HORDEACEUS  E.L    UkN l. 
{"catalogNumber": "1407396", "order": "", "family": "Poaceae", "scientificName": "Bromus hordeaceus", "scientificNameAuthorship": "L.", "genus": "Bromus", "subgenus": "", "specificEpithet": "hordeaceus", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "", "recordNumber": "2684", "verbatimEventDate": "1941-04-13", "habitat": "", "occurrenceRemarks": "", "associatedTaxa": "", "country": "", "stateProvince": "California", "county": "Santa Clara", "municipality": "", "locality": "Contact UM Herbarium", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}