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": ""}
MEDICAGO *O    nu[ John Dix Field, University Botanical Gardens  yUV Medicago lupulina      "FIELD INDENTIF. CHARACTERS: FLS YELLOW, 10 OR M<ORE IN EACH HEAD, 2-4MM; SMALL TOOTHED UPPER END (OF LFL." e   T1RJ. FABALES washtenaw  !      edward g. voss )      @KA 42.304442   y1 u% s.n.   Y.6 1221426   united states UZlW   l. Fo     i -83.X657491
{"catalogNumber": "1221426", "order": "Fabales", "family": "", "scientificName": "Medicago lupulina", "scientificNameAuthorship": "L.", "genus": "Medicago", "subgenus": "", "specificEpithet": "", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "Edward G. Voss", "recordedBy": "", "recordNumber": "s.n.", "verbatimEventDate": "", "habitat": "", "occurrenceRemarks": "\"Field indentif. characters: fls yellow, 10 or more in each head, 2-4mm; small toothed upper end of lfl.\"", "associatedTaxa": "", "country": "United States", "stateProvince": "", "county": "Washtenaw", "municipality": "", "locality": "John Dix Field, University Botanical Gardens", "decimalLatitude": "42.304442", "decimalLongitude": "-83.657491", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}