These spiral vessels are part of a banana plant stem.

这些螺旋状的脉管是香蕉植物茎的一部分。

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This is a plant stem that has been pithed.

这是一根已经除去木髓的植物的茎。

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The plant stem may grow more than fruits, for example.

例如，植物的茎可能比果实还要长得好。

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The buds release this hormone down the plant stem.

VOA: special.2009.10.06

The soaptree yucca plant can make its stem grow longer to keep its leaves above the sand.

VOA: special.2010.01.04

The echinacea sold in drugstores comes in a wide range of liquids, pills, powders, and tinctures, which can be derived from some combination of the plant's root, flower, or stem.

CNN: Echinacea fails to curb the common cold (again)

But new research found that, like stem rust, stripe rust increases its genetic variability by reproducing sexually on the leaves of another host plant (the barberry), making itself more adaptable and more deadly.

ECONOMIST: Wheat rust and world farming