Considered one of the only 2-needle pines with blue/green foliage this would be a great identification feature if there wasn’t so much variation. Color varies from olive green, gray/green to blue/green. This image shows the most common form: 2-needles per bundle, blue/green color and the characteristic twist to each needle.
Herman, D.E., et al. 1996. North Dakota tree handbook. USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Administration, Bismarck.
Pinaceae, tree, conifer, cone, needle, evergreen, Pinus sylvestris, Scots pine, Scotch pine