{"id":"id-003","license":"CC-BY-4.0","data":{"title":"Spruce or fir: roll a needle","file":"/diagrams/id-003-spruce-or-fir-roll-a-needle.svg","caption":"FA Exhibit ID-003. Spruce or fir: roll a needle.","alt":"Two sourced specimen panels compare the four-sided needles of Engelmann spruce with the flattened needles of subalpine fir. A schematic section shows why the spruce needle rolls between fingertips while the fir needle stays flat.","kind":"diagram","rights":"cc-by-4.0","depicts":"For the two named western species on this sheet, needle section supplies a quick first sort","identifiableAddress":false,"exifGpsStripped":true,"derivation":"Morphology from USFS FEIS PICENG and ABILAS. Specimens after Sudworth 1908, figs. 29 and 38, public domain.","technicalReviewer":"Grayson Graham","lastVerified":"2026-08-25T00:00:00.000Z","sourceUrl":"https://research.fs.usda.gov/feis/species-reviews/piceng"}}