More on xylem from Fact Monster:

• stem - stem stem, supporting structure of a plant, serving also to conduct and to store food materials. ...
• wood - wood wood, botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem ...
• Rhyniophyta - Rhyniophyta Rhyniophyta , division of plants known only from fossils, of which the genus Rhynia was ...
• Magnoliophyta - Magnoliophyta Magnoliophyta , division of the plant kingdom consisting of those organisms commonly ...
• pith - pith pith, in botany, core of the stem of most plants. Pith is composed of large, loosely packed ...

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