primarystem213-page7

primarystem213-page7 - Although we will discuss this more...

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The Shoot System: Primary Stem Structure - 7 Special Variations in some Monocots Hollow Stems In some monocot stems a central pith cavity develops from cells of the ground tissue that are destroyed during early growth. This gives an appearance of a ring of vascular bundles, similar to eudicot patterns, surrounding the hollow central cavity. Intercalary Meristems Many grasses have meristem layers at the bases of nodes, which provide for non- apical growth and enlargement of cells throughout the plant stems. (which is why we have to mow lawns). Thickened Meristems Some monocots achieve great dimensions without secondary growth.
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Unformatted text preview: Although we will discuss this more when we discuss secondary growth and woody plants, one way in which a plant can have a larger girth is to produce a meristem that proliferates laterally just below the apical meristem. This thickened meristem is so large that the true apical meristem with its leaf primordia appears sunken into this area. The thickened meristem is procambium, which produces huge numbers of vascular bundles within the stem. This region of proliferating procambium is known as the meristematic cap....
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