{"id":"alnus-glutinosa","license":"CC-BY-4.0","data":{"scientificName":"Alnus glutinosa","commonNames":["European alder"],"taxonRank":"species","acceptedName":"Alnus glutinosa","family":"Betulaceae","ids":{"usdaSymbol":"ALGL2","gbifKey":2876213,"itisTsn":19470,"wikidataQid":"Q156904","inatTaxonId":966205},"usdaZoneMin":"6a","zoneSource":"fps-2016","states":["CT","DC","DE","IA","IL","IN","KS","KY","MA","MD","MI","MN","MO","MS","NJ","NY","OH","PA","TN","VA","VT","WI","WV"],"rangeAssertions":[{"relation":"introduced","geography":{"grain":"state","stateCodes":["CT"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 CNT — Connecticut"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 IOW — Iowa"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IL"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 ILL — Illinois"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IN"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 INI — Indiana"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["KY"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 KTY — Kentucky"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 MAS — Massachusetts"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MD"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 MRY — Maryland"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 MIC — Michigan"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MN"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 MIN — Minnesota"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["NJ"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 NWJ — New Jersey"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["NY"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 NWY — New York"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["OH"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 OHI — Ohio"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["PA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 PEN — Pennsylvania"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["RI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 RHO — Rhode I."]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["VT"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 VER — Vermont"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["WI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 WIS — Wisconsin"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"}],"invasiveIn":[{"state":"L48","status":"invasive-reported","source":"us-riis"}],"statusAssertions":[{"status":"prohibited","channel":"regulatory","geography":{"grain":"state","stateCodes":["IN"]},"authority":"Indiana Department of Natural Resources","source":"indiana-312-iac-18-3-25-2020","sourceRecordId":"indiana:312-iac-18-3-25:a:004","sourceVersion":"IAC-2026-312-18-3-25+20190417-IR-312180316FRA+20190417-IR-312190176ACA+20250423-IR-312240574RFA","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"312 IAC 18-3-25","label":"Prohibited invasive terrestrial plant — current rule fully enforceable since April 18, 2020"},"associatedReferences":["https://iar.iga.in.gov/code/2026/312/18#312-18-3-25","https://www.in.gov/nrc/files/nrc_jan_2019_minutes.pdf","https://www.in.gov/nrc/files/LSA24-574_Readopted-Final-Rule.pdf","https://www.in.gov/dnr/rules-and-regulations/invasive-species/terrestrial-invasive-species-plants","https://www.in.gov/dnr/files/ep-terrestrial_plant_rule.pdf","https://www.in.gov/isda/files/guidebook_full-compressed.pdf"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"The rule applies to any part or life stage of each listed species. A person must not sell, offer or grow for sale, gift, barter, exchange, distribute, transport, or transfer that material in Indiana.","effectiveOn":"2020-04-18T00:00:00.000Z","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"activity-restriction","statement":"The rule applies to any part or life stage of each listed species. A person must not introduce that material in Indiana.","effectiveOn":"2019-04-18T00:00:00.000Z","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"operational-exception","statement":"This section does not apply to a person who possesses a listed species under a permit issued by the Indiana State Entomologist.","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"operational-exception","statement":"This section does not apply to a person engaged in a project approved by the Indiana State Entomologist for destruction of a listed species.","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"named-taxon-only","exceptionReview":"reviewed-not-excepted","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; FireApproved publishes only this unique exact same-rank plant match and does not project hybrids, the infraspecific designation, or the parenthetical Chinese-yam form"}},{"status":"prohibited","channel":"regulatory","geography":{"grain":"state","stateCodes":["ME"]},"authority":"Maine Department of Agriculture, Conservation and Forestry","source":"maine-chapter-273-invasive-plants-2022-092","sourceRecordId":"maine:prohibited:034","sourceVersion":"Chapter-273-filing-2022-092-format-corrected-2025-09-24","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"Chapter 273 Do Not Sell","label":"Specified living-plant trade activities prohibited since 2024-01-01"},"associatedReferences":["https://www.maine.gov/DACF/php/horticulture/invasiveplants.shtml","https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"Living viable material may not be imported, exported, bought, sold, or intentionally propagated for sale or distribution.","effectiveOn":"2024-01-01T00:00:00.000Z","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"},{"kind":"permit-required","statement":"The State Horticulturist may permit importation and field experimentation for scientific, educational, or other approved purposes under prescribed conditions.","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"},{"kind":"material-scope-exception","statement":"Preserved herbarium specimens and material preserved by other means are exempt from Chapter 273.","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"includes-subordinate-taxa-with-exceptions","exceptionReview":"reviewed-not-excepted","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; Chapter 273 defines species to include synonyms, subspecies, hybrids, varieties, forms, and cultivars, but FireApproved publishes only this unique exact species match; the rule provides a committee exemption process for researched subordinate taxa and no current approved-exemption roster was located"}},{"status":"regulated","channel":"regulatory","geography":{"grain":"state","stateCodes":["MA"]},"authority":"Massachusetts Department of Agricultural Resources","source":"massachusetts-prohibited-plant-list-2026-05","sourceRecordId":"massachusetts:021:alnus-glutinosa","sourceVersion":"Massachusetts-Prohibited-Plant-List-May-2026","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"Massachusetts Prohibited Plant List","label":"Current prohibited-list restriction with operating conditions"},"associatedReferences":["https://www.mass.gov/info-details/massachusetts-prohibited-plant-list","https://www.mass.gov/files/csv/2026-05/prohibitedplantlistMay2026.csv"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"No new stock may be imported or propagated after 12/8/2025.","effectiveOn":"2025-12-08T00:00:00.000Z","sourceUrl":"https://www.mass.gov/info-details/massachusetts-prohibited-plant-list"},{"kind":"sales-phase-out","statement":"Existing stock may be sold only through 12/31/2028.","endsOn":"2028-12-31T00:00:00.000Z","sourceUrl":"https://www.mass.gov/info-details/massachusetts-prohibited-plant-list"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"includes-subordinate-taxa","exceptionReview":"not-applicable","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; the official page applies the list to cultivars, varieties, and hybrids, while FireApproved publishes only this unique exact species match; activity, timing, operator, and permit conditions are modeled separately from taxonomic scope"}},{"status":"widespread-invasive","channel":"ecological","geography":{"grain":"aggregate-region","regions":["L48"]},"source":"us-riis-v2","sourceRecordId":"USRIIS-L48-Plantae6259","sourceVersion":"2.0 (November 2022)","asOf":"2022-10-23T00:00:00.000Z","sourceModified":"2022-06-30T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"Species"},"sourceDesignation":{"code":"E","label":"widespread invasive (category E)"},"associatedReferences":["USDA Natural Resources Conservation Service (NRCS) PLANTS Database (2021fr), https://plants.usda.gov/home/plantProfile?symbol=ALGL2"],"taxonProjection":{"basis":"exact-taxon","notes":"exact source identifier, rank, family, and scientific/accepted name"}}],"hardinessAssertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"alnus-glutinosa","sourceTaxon":"Alnus glutinosa","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"5a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-18,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"ALGL2","sourceTaxon":"Alnus glutinosa","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 69901, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"tree","matureHeightFt":50,"sun":"full","waterNeed":"moderate","photo":{"file":"/images/plants/alnus-glutinosa.jpg","sourceUrl":"https://www.inaturalist.org/photos/204625600","observationUrl":"https://www.inaturalist.org/observations/120950999","license":"cc-by-sa","attribution":"(c) Douglas Goldman, some rights reserved (CC BY-SA)","fetchedOn":"2026-08-23T00:00:00.000Z"},"evidence":[{"source":"fps-eastern-us","verdict":"mixed","verdictRaw":"AT RISK Firewise (3)","claims":"Imported tree for city planting.","sourcePlacement":{"value":"LZ3","scheme":"fps-landscape-zone"},"edition":"2016-wayback","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"idaho-firewise-master-db","verdict":"mixed","verdictRaw":"fire-resistance score 4 of 10","score":{"value":4,"scale":"idaho-0-10"},"sourcePlacement":{"value":"plantable at 70' from home","scheme":"idaho-distance"},"url":"https://idahofirewise.org/wp-content/uploads/2017/04/FireXResistanceXofXPlantsXMasterXDatabase.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"girona-pirojardineria-2020","verdict":"recommend","verdictRaw":"MUY RECOMENDADA","claims":"Alnus glutinosa is rated “MUY RECOMENDADA” by the guide's qualitative IUF garden-suitability method. The method assumes species-specific care and integrates fire evidence with fuel structure, maintenance, origin, invasiveness, and expert fire-service experience.","sourcePlacement":{"value":"suitable inside or outside the 25-metre maximum-risk zone","scheme":"girona-2020-iuf-25m-suitability"},"edition":"2020 Spanish edition","url":"https://interior.gencat.cat/web/.content/home/030_arees_dactuacio/bombers/foc_forestal/publicacions_tecniques_i_normativa/guies_tecniques/prevencio_i_extincio/2020_Guia_de_pirojardineria_es.pdf","documentDate":"2020-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"flamits","verdict":"not-rated","verdictRaw":"calorific value (kcal/kg): 5039.65","score":{"value":5039.65,"scale":"FLAMITS — calorific value (kcal/kg)"},"claims":"FLAMITS record 3925; Combustibility measurement; plant part twigs; fuel live; predrying yes; device calorimeter; site Gillon1997-1; sampling june to september. Primary study Gillon1997: Gillon, D., Hernando, C., Valette, J.-C., & Joffre, R. (1997). Fast estimation of the calorific values of forest fuels by near infrared-reflectance spectroscopy. Canadian Journal of Forest Research, 27, 760-765.","plantPart":"shoot","original":"Gillon1997","edition":"Dryad version 9","url":"https://doi.org/10.5061/dryad.h18931zr3","documentDate":"2023-12-22T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"}],"flammabilityClass":"fire-resistant","ratingReason":"limited-evidence","recommendation":"on-list","author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z","reviewNotes":"Photo auto-selected (top-voted iNat); human review pending."},"localAssessmentInputs":{"stateDistribution":["CT","DC","DE","IA","IL","IN","KS","KY","MA","MD","MI","MN","MO","MS","NJ","NY","OH","PA","TN","VA","VT","WI","WV"],"nativeStates":[],"rangeAssertions":[{"relation":"introduced","geography":{"grain":"state","stateCodes":["CT"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 CNT — Connecticut"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 IOW — Iowa"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IL"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 ILL — Illinois"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["IN"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 INI — Indiana"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["KY"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 KTY — Kentucky"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 MAS — Massachusetts"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MD"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 MRY — Maryland"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 MIC — Michigan"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["MN"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 MIN — Minnesota"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["NJ"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 NWJ — New Jersey"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["NY"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 NWY — New York"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["OH"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 OHI — Ohio"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["PA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 PEN — Pennsylvania"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["RI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 RHO — Rhode I."]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["VT"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 75 — Northeastern U.S.A.","TDWG level 3 VER — Vermont"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"introduced","geography":{"grain":"state","stateCodes":["WI"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 74 — North-Central U.S.A.","TDWG level 3 WIS — Wisconsin"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"documented-occurrence","geography":{"grain":"state","stateCodes":["CT","DC","DE","IA","IL","IN","KS","KY","MA","MD","MI","MN","MO","MS","NJ","NY","OH","PA","TN","VA","VT","WI","WV"]},"provenance":"legacy-field"}],"usdaZoneMin":"6a","usdaZoneMax":null,"hardinessAssertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"alnus-glutinosa","sourceTaxon":"Alnus glutinosa","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"5a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-18,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"ALGL2","sourceTaxon":"Alnus glutinosa","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 69901, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}],"hardinessSelection":{"status":"selected","assertion":{"minimum":"5a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-18,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"ALGL2","sourceTaxon":"Alnus glutinosa","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 69901, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},"assertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"alnus-glutinosa","sourceTaxon":"Alnus glutinosa","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"5a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-18,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"ALGL2","sourceTaxon":"Alnus glutinosa","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 69901, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}]},"invasiveIn":[{"state":"L48","status":"invasive-reported","source":"us-riis"}],"statusAssertions":[{"status":"prohibited","channel":"regulatory","geography":{"grain":"state","stateCodes":["IN"]},"authority":"Indiana Department of Natural Resources","source":"indiana-312-iac-18-3-25-2020","sourceRecordId":"indiana:312-iac-18-3-25:a:004","sourceVersion":"IAC-2026-312-18-3-25+20190417-IR-312180316FRA+20190417-IR-312190176ACA+20250423-IR-312240574RFA","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"312 IAC 18-3-25","label":"Prohibited invasive terrestrial plant — current rule fully enforceable since April 18, 2020"},"associatedReferences":["https://iar.iga.in.gov/code/2026/312/18#312-18-3-25","https://www.in.gov/nrc/files/nrc_jan_2019_minutes.pdf","https://www.in.gov/nrc/files/LSA24-574_Readopted-Final-Rule.pdf","https://www.in.gov/dnr/rules-and-regulations/invasive-species/terrestrial-invasive-species-plants","https://www.in.gov/dnr/files/ep-terrestrial_plant_rule.pdf","https://www.in.gov/isda/files/guidebook_full-compressed.pdf"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"The rule applies to any part or life stage of each listed species. A person must not sell, offer or grow for sale, gift, barter, exchange, distribute, transport, or transfer that material in Indiana.","effectiveOn":"2020-04-18T00:00:00.000Z","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"activity-restriction","statement":"The rule applies to any part or life stage of each listed species. A person must not introduce that material in Indiana.","effectiveOn":"2019-04-18T00:00:00.000Z","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"operational-exception","statement":"This section does not apply to a person who possesses a listed species under a permit issued by the Indiana State Entomologist.","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"},{"kind":"operational-exception","statement":"This section does not apply to a person engaged in a project approved by the Indiana State Entomologist for destruction of a listed species.","sourceUrl":"https://iar.iga.in.gov/code/2026/312/18#312-18-3-25"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"named-taxon-only","exceptionReview":"reviewed-not-excepted","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; FireApproved publishes only this unique exact same-rank plant match and does not project hybrids, the infraspecific designation, or the parenthetical Chinese-yam form"},"provenance":"cited"},{"status":"prohibited","channel":"regulatory","geography":{"grain":"state","stateCodes":["ME"]},"authority":"Maine Department of Agriculture, Conservation and Forestry","source":"maine-chapter-273-invasive-plants-2022-092","sourceRecordId":"maine:prohibited:034","sourceVersion":"Chapter-273-filing-2022-092-format-corrected-2025-09-24","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"Chapter 273 Do Not Sell","label":"Specified living-plant trade activities prohibited since 2024-01-01"},"associatedReferences":["https://www.maine.gov/DACF/php/horticulture/invasiveplants.shtml","https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"Living viable material may not be imported, exported, bought, sold, or intentionally propagated for sale or distribution.","effectiveOn":"2024-01-01T00:00:00.000Z","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"},{"kind":"permit-required","statement":"The State Horticulturist may permit importation and field experimentation for scientific, educational, or other approved purposes under prescribed conditions.","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"},{"kind":"material-scope-exception","statement":"Preserved herbarium specimens and material preserved by other means are exempt from Chapter 273.","sourceUrl":"https://www.maine.gov/sos/sites/maine.gov.sos/files/rules/001c273-2022-092.docx"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"includes-subordinate-taxa-with-exceptions","exceptionReview":"reviewed-not-excepted","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; Chapter 273 defines species to include synonyms, subspecies, hybrids, varieties, forms, and cultivars, but FireApproved publishes only this unique exact species match; the rule provides a committee exemption process for researched subordinate taxa and no current approved-exemption roster was located"},"provenance":"cited"},{"status":"regulated","channel":"regulatory","geography":{"grain":"state","stateCodes":["MA"]},"authority":"Massachusetts Department of Agricultural Resources","source":"massachusetts-prohibited-plant-list-2026-05","sourceRecordId":"massachusetts:021:alnus-glutinosa","sourceVersion":"Massachusetts-Prohibited-Plant-List-May-2026","asOf":"2026-08-26T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"species"},"sourceDesignation":{"code":"Massachusetts Prohibited Plant List","label":"Current prohibited-list restriction with operating conditions"},"associatedReferences":["https://www.mass.gov/info-details/massachusetts-prohibited-plant-list","https://www.mass.gov/files/csv/2026-05/prohibitedplantlistMay2026.csv"],"regulatoryConditions":[{"kind":"activity-restriction","statement":"No new stock may be imported or propagated after 12/8/2025.","effectiveOn":"2025-12-08T00:00:00.000Z","sourceUrl":"https://www.mass.gov/info-details/massachusetts-prohibited-plant-list"},{"kind":"sales-phase-out","statement":"Existing stock may be sold only through 12/31/2028.","endsOn":"2028-12-31T00:00:00.000Z","sourceUrl":"https://www.mass.gov/info-details/massachusetts-prohibited-plant-list"}],"taxonProjection":{"basis":"exact-taxon","legalScope":"includes-subordinate-taxa","exceptionReview":"not-applicable","notes":"unique exact same-rank source scientific/accepted name match; no subordinate projection; the official page applies the list to cultivars, varieties, and hybrids, while FireApproved publishes only this unique exact species match; activity, timing, operator, and permit conditions are modeled separately from taxonomic scope"},"provenance":"cited"},{"status":"widespread-invasive","channel":"ecological","geography":{"grain":"aggregate-region","regions":["L48"]},"source":"us-riis-v2","sourceRecordId":"USRIIS-L48-Plantae6259","sourceVersion":"2.0 (November 2022)","asOf":"2022-10-23T00:00:00.000Z","sourceModified":"2022-06-30T00:00:00.000Z","sourceTaxon":{"name":"Alnus glutinosa","rank":"species","rawRank":"Species"},"sourceDesignation":{"code":"E","label":"widespread invasive (category E)"},"associatedReferences":["USDA Natural Resources Conservation Service (NRCS) PLANTS Database (2021fr), https://plants.usda.gov/home/plantProfile?symbol=ALGL2"],"taxonProjection":{"basis":"exact-taxon","notes":"exact source identifier, rank, family, and scientific/accepted name"},"provenance":"cited"}],"fireEvidenceClass":"fire-resistant","recommendation":"on-list","fireSourceScopes":[{"source":"idaho-firewise-master-db","sourceName":"Fire Resistance of Plants Master Database","sourceUrl":"https://idahofirewise.org/wp-content/uploads/2017/04/FireXResistanceXofXPlantsXMasterXDatabase.pdf","geography":{"grain":"aggregate-region","stateCodes":["ID"],"regions":["Southern Idaho"]},"completeness":"partial","reviewStatus":"reviewed","scope":"The official database labels itself \"For Southern Idaho\" and describes Idaho residents at the urban-rangeland interface. FireApproved publishes 419 existing plant owners that cite its scored rows. This bounded Southern Idaho scope is regional context, not statewide coverage or a conclusion that the score transfers unchanged to every Idaho site.","sourceVersion":"Idaho-Firewise-Southern-Idaho-Master-2013-11-08","asOf":"2013-11-08T00:00:00.000Z"}],"firePerformanceConditions":[],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":[],"invasiveIn":[{"state":"IN","status":"noxious-listed","source":"indiana-312-iac-18-3-25-2020"},{"state":"ME","status":"noxious-listed","source":"maine-chapter-273-invasive-plants-2022-092"},{"state":"MA","status":"noxious-listed","source":"massachusetts-prohibited-plant-list-2026-05"},{"state":"L48","status":"invasive-reported","source":"us-riis-v2"}],"usdaZoneMin":"5a"},"localAssessmentContract":"Compare each dimension separately. State noxious-weed seed designations are material-scoped and never become non-seed plant restrictions, ecological-invasive findings, nursery restrictions, alternatives, product evidence, or fire votes. Introduced/established context is not an invasive warning. Minimum-only hardiness has no inferred maximum; canonical source-temperature conversion is validated and contradictory applicable rows project no primary zone. L48 context applies only to conterminous states and is never exact-state status. Fire-performance conditions are not maintenance advice. FEIS fire-ecology context does not vote in the plant classification. Absence of a status row is not regulatory clearance."}