What is aerenchyma, you might ask? It's something that aquatic plants have within their tissues to enable them to stand upright in water currents, without needing their own sturdy structure - they make use of air spaces that keep them buoyant and also help with gas exchange within the plant.
I cut through the cross section of a thick stem of variable milfoil and took a photo to show the aerenchyma (air-filled cavities) within
Look at all the gaps/air spaces within the stem above. It makes the cross section look like a wagon wheel or an orange slice, but with air spaces. What a fantastic adaptation. Here are two more, free floating in water:
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