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": ""}
 mrq united states   .[ o Salix nigra  1981-05-23 r wa   / 1318163 SALIX kW    Marshall +K?|+    "three small trees, the largest about 9 m x 8 cm, with s. interior, s. amygdaloides, s. rigida, and populus deltoides. note perfect flowers near base of some catkins!" w>7;A  MICHIGAN  o!    Malpighiales WLh5  nigra >=`   kHX< Eaton  w   near center point of west boundary East side of Boyer Roo., 0.5 mi south of inJtersection with Hwy. M-43 (Gr<and Ledge Hwy.).   s 851   2% f  roy e. gereau 42.7562 9lf    zxB -84.7512
{"catalogNumber": "1318163", "order": "Malpighiales", "family": "", "scientificName": "Salix nigra", "scientificNameAuthorship": "Marshall", "genus": "Salix", "subgenus": "", "specificEpithet": "nigra", "verbatimTaxonRank": "", "infraspecificEpithet": "", "identifiedBy": "", "recordedBy": "Roy E. Gereau", "recordNumber": "851", "verbatimEventDate": "1981-05-23", "habitat": "", "occurrenceRemarks": "\"Three small trees, the largest about 9 m x 8 cm, with S. interior, S. amygdaloides, S. rigida, and Populus deltoides. Note perfect flowers near base of some catkins!\"", "associatedTaxa": "", "country": "United States", "stateProvince": "Michigan", "county": "Eaton", "municipality": "", "locality": "near center point of west boundary East side of Boyer Rod., 0.5 mi south of intersection with Hwy. M-43 (Grand Ledge Hwy.).", "decimalLatitude": "42.7562", "decimalLongitude": "-84.7512", "verbatimCoordinates": "", "minimumElevationInMeters": "", "maximumElevationInMeters": ""}