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Images
Figure 1 - Capri23auto "Pine Branch Spruce Drive Spruce Needles Engine", Pixabay. 2018. https://pixabay.com/photos/pine-branch-spruce-drive-spruce-3382898/
Figure 2 - Hagstrom, J. M., Mortonarb. https://www.mortonarb.org/trees-plants/tree-plant-descriptions/white-spruce
Figure 3 - Osnas, J., Preston, K., "young spruce tips, still capped with bud scales", Botanistinthekitchen. 2018. https://botanistinthekitchen.blog/2018/06/15/spruce-tips/
Figure 4 - USA National Phenology Network. 2013. https://www.usanpn.org/node/20771
Figure 2 - Hagstrom, J. M., Mortonarb. https://www.mortonarb.org/trees-plants/tree-plant-descriptions/white-spruce
Figure 3 - Osnas, J., Preston, K., "young spruce tips, still capped with bud scales", Botanistinthekitchen. 2018. https://botanistinthekitchen.blog/2018/06/15/spruce-tips/
Figure 4 - USA National Phenology Network. 2013. https://www.usanpn.org/node/20771