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It turns out that defining what is and isn't a “tree” is way harder than it seems.
To learn more about this topic, start your googling with these keywords:
Wood: A bunch of cellulose fibers intertwined with lignin usually found in the trunk of a tree.
Trunk: A wooden stem that thickens over time.
Bonsai: An ornamental tree or shrub that is artificially prevented from reaching its normal size.
Shrub: A woody plant that is smaller than a tree.
Gymnosperm: A group of plants, including conifers, that have naked seeds.
Angiosperm: A group of plants, including lots of other “trees” that have enclosed seeds.
Monocots: A group of flowering plants - mostly angiosperms - with a single embryonic leaf that includes palm trees.
Dicots: A group of flowering plants - mostly angiosperms - with two embryonic leaves that includes oak trees.
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Georg Miehe, Sabine Miehe, Jonas Vogel, Sonam Co, Duo La. (2007) "Highest Treeline in the Northern Hemisphere Found in Southern Tibet," Mountain Research and Development, 27(2), 169-173. Retrieved from: https://bioone.org/journals/mountain-research-and-development/volume-27/issue-2/mrd.0792/Highest-Treeline-in-the-Northern-Hemisphere-Found-in-Southern-Tibet/10.1659/mrd.0792.full#i0276-4741-27-2-169-b33
Ellenberg, H., Mueller-Dombois, D. (1965). A key to Raunkiaer plant life forms with revised subdivisions. Retrieved from: https://www.e-periodica.ch/cntmng?pid=bgi-002%3A1965%3A37%3A%3A130
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Ehrenberg, Rachel. (2018). “What Makes A Tree A Tree?” Knowable Magazine. Retrieved from: https://knowablemagazine.org/article/living-world/2018/what-makes-tree-tree#:~:text=A%20banana%20tree%27s%20trunk%20doesn,cells%20typical%20of%20most%20trees
Christophe Plomion, Grégoire Leprovost, Alexia Stokes. (2001). “Wood Formation in Trees”. Plant Physiology, Volume 127, 4: 1513–1523. Retrieved from: https://doi.org/10.1104/pp.010816
Ray, Georgia (2021). "There’s no such thing as a tree (phylogenetically)". Eukaryote Writes Blog. Retrieved from: https://eukaryotewritesblog.com/2021/05/02/theres-no-such-thing-as-a-tree/