{"id":"quercus-douglasii","license":"CC-BY-4.0","data":{"scientificName":"Quercus douglasii","commonNames":["Quercus douglasii"],"taxonRank":"species","acceptedName":"Quercus douglasii","family":"Fagaceae","ids":{"usdaSymbol":"QUDO","gbifKey":2878266},"usdaZoneMin":"8a","zoneSource":"usda-plants","states":["CA"],"rangeAssertions":[{"relation":"native","geography":{"grain":"state","stateCodes":["CA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 CAL — California"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"}],"hardinessAssertions":[{"minimum":"8a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":10,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"QUDO","sourceTaxon":"Quercus douglasii","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 70236, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"tree","matureHeightFt":60,"waterNeed":"low","evidence":[{"source":"flamits","verdict":"not-rated","verdictRaw":"flame height (cm): 21.7","score":{"value":21.7,"scale":"FLAMITS — flame height (cm)"},"claims":"FLAMITS record 3230; Combustibility measurement; plant part litter; fuel all; predrying yes; device burning bench; site Engber2012-1; sampling ND. Primary study Engber2012: Engber, E. A., & Varner, J. M. (2012). Patterns of flammability of the California oaks: the role of leaf traits. Canadian Journal of Forest Research, 42, 1965-1975.","plantPart":"litter","original":"Engber2012","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"},{"source":"flamits","verdict":"not-rated","verdictRaw":"flaming duration (s): 113.1","score":{"value":113.1,"scale":"FLAMITS — flaming duration (s)"},"claims":"FLAMITS record 3248; Sustainability measurement; plant part litter; fuel all; predrying yes; device burning bench; site Engber2012-1; sampling ND. Primary study Engber2012: Engber, E. A., & Varner, J. M. (2012). Patterns of flammability of the California oaks: the role of leaf traits. Canadian Journal of Forest Research, 42, 1965-1975.","plantPart":"litter","original":"Engber2012","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"},{"source":"flamits","verdict":"not-rated","verdictRaw":"burnt biomass (%): 59.6","score":{"value":59.6,"scale":"FLAMITS — burnt biomass (%)"},"claims":"FLAMITS record 3266; Consumability measurement; plant part litter; fuel all; predrying yes; device burning bench; site Engber2012-1; sampling ND. Primary study Engber2012: Engber, E. A., & Varner, J. M. (2012). Patterns of flammability of the California oaks: the role of leaf traits. Canadian Journal of Forest Research, 42, 1965-1975.","plantPart":"litter","original":"Engber2012","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"},{"source":"flamits","verdict":"not-rated","verdictRaw":"smouldering duration (s): 296","score":{"value":296,"scale":"FLAMITS — smouldering duration (s)"},"claims":"FLAMITS record 3284; Sustainability measurement; plant part litter; fuel all; predrying yes; device burning bench; site Engber2012-1; sampling ND. Primary study Engber2012: Engber, E. A., & Varner, J. M. (2012). Patterns of flammability of the California oaks: the role of leaf traits. Canadian Journal of Forest Research, 42, 1965-1975.","plantPart":"litter","original":"Engber2012","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":"mixed-evidence","ratingReason":"limited-evidence","recommendation":"candidate","author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-25T00:00:00.000Z","reviewNotes":"FLAMITS measurements are retained as non-voting evidence; the database publishes no cross-variable directional threshold."},"localAssessmentInputs":{"stateDistribution":["CA"],"nativeStates":[],"rangeAssertions":[{"relation":"native","geography":{"grain":"state","stateCodes":["CA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 CAL — California"]},"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":["CA"]},"provenance":"legacy-field"}],"usdaZoneMin":"8a","usdaZoneMax":null,"hardinessAssertions":[{"minimum":"8a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":10,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"QUDO","sourceTaxon":"Quercus douglasii","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 70236, 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":"8a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":10,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"QUDO","sourceTaxon":"Quercus douglasii","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 70236, 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":"8a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":10,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"QUDO","sourceTaxon":"Quercus douglasii","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 70236, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}]},"invasiveIn":[],"statusAssertions":[],"fireEvidenceClass":"mixed-evidence","recommendation":"candidate","fireSourceScopes":[],"firePerformanceConditions":[],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":["CA"],"invasiveIn":[],"usdaZoneMin":"8a"},"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."}