这些殖民地的植物也需要坚硬有弹性的茎高于土壤，茎可以弯曲很多，但不会断裂，因为水不断闯入他们。

The plants in these colonies also need tough resilient stems above the soil, stems that can bent a lot but not break as water constantly crashes into them.

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很多的茎和根都是辐射对称的。

Many stems and roots show radial symmetry.

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茎的皮层和髓部具很多大型的薄壁细胞。

There are lots of large parenchyma cells in the cortex and pith of the stem.

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