Helianthus young mature stem

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All vascular tissues in Helianthus are the product of primary growth. There are no signs of secondary growth growth rings or lateral meristems as might be seen in woody stems. Within the stele the vascular bundles are arranged in a ring and separated from each other by wide medullary rays of parenchyma cells. The collaterally arranged vascular bundles are almost entirely primary phloem and xylem.
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Helianthus Young & Mature Stems Prepared Microscope Slide 11-12AB

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Herbaceous Dicot Stem: Young Helianthus | cross section: You… | Flickr

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Herbaceous Dicot Stem: Young Helianthus

The transverse section through the internode of stem is more or less circular in outline and exhibits the following arrangement and structure of tissues from periphery towards centre Figs. The outermost layer is the epidermis. It is uniseriate and composed of living parenchyma cells.
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