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": ""}
  Vf UNITED STATES   ?6n Rudbeckia hirta   _  2370      7?&y3 1989-07-21   _ Dan J. Skean, Jr. -84.81651 (   42.31438 )%D0V   rudbeckia @  Asteraceae F6_tS   L j Rich woods w ith Acer saccharum, A. saccharinum, A. rubrum, Tilia americana, Fagus grandifolia, Quercus spp., Liriodendron tulipifera.     ?? Calhoun 1256258 @    xLu "OCCASIONAL IN DISTURBED OPEN FIELD AND ALONG TRAILS NEAR NW ENTRANCE. DISK FLOWERS BROWN. RAY FLOWERS YELLOW."  O MICHIGAN
{"catalogNumber": "1256258", "order": "", "family": "Asteraceae", "scientificName": "Rudbeckia hirta", "scientificNameAuthorship": "", "genus": "Rudbeckia", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Dan J. Skean, Jr.", "recordNumber": "2370", "verbatimEventDate": "1989-07-21", "habitat": "Rich woods with Acer saccharum, A. saccharinum, A. rubrum, Tilia americana, Fagus grandifolia, Quercus spp., Liriodendron tulipifera.", "occurrenceRemarks": "\"Occasional in disturbed open field and along trails near NW entrance. Disk flowers brown. Ray flowers yellow.\"", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Calhoun", "municipality": "", "locality": "", "decimalLatitude": "42.31438", "decimalLongitude": "-84.81651", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}