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": ""}
asteraceae l     ITo 1256469 L.M. Umbach a    V3+T MICHIGAM     [STEM SOMEWHAT 4-ANGLED] inQGp  VAN BUREN   x B   SILPHIUM ^Ko   owN!A Silphium integrifolium   !  Asterales  Sik(^ michx.  v`? UNITED STATES    6N integrifolium    
{"catalogNumber": "1256469", "order": "Asterales", "family": "Asteraceae", "scientificName": "Silphium integrifolium", "scientificNameAuthorship": "Michx.", "genus": "Silphium", "subgenus": "", "specificEpithet": "integrifolium", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "L.M. Umbach", "recordNumber": "", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "[stem somewhat 4-angled]", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Van Buren", "municipality": "", "locality": "", "decimalLatitude": "", "decimalLongitude": "", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}