Plants Part 3. Stems. Stem. Main function: to hold up the leaves and conduct substances between the root and the leaves. Two types of stems: herbaceous and woody.
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Fuel: ethanol, wood
Food: sugar cane, potatoes, maple syrup, asparagus
Textiles: flax, hemp, bamboo
Other chemicals: tannin (wood stain), turpentine, latex rubber
Medicine: salicyclic acid (pain reliever from willow bark), taxol (anti-cancer drug made of yew tree bark)