Vascular bundles are present throughout the monocot stem, although concentrated towards the outside. This differs from the monocot root that has a ring of vascular bundles and often none in the center.
a ring of primary vascular bundles in the stem
taproot system Compare: monocot
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Monocot stems have scattered vascular bundles. Dicot stems have their vascular bundles in a ring arrangement. Monocot stems have most of their vascular bundles near the outside edge of the stem.
The dicotyledons are in the class Magnoliopsida and have these features: either woody or herbaceous, flower parts usually in fours and fives, leaves usually net-veined, vascular bundles arranged in a circle within the stem, ...
Stem vascular arrangement -- Vascular tissue occurs in long strands called vascular bundles. These bundles are arranged within the stem of dicots to form a cylinder, appearing as a ring of spots when you cut across the stem.
pith ray The region or tissue located between vascular bundles in a stem and connecting the pith and cortex; also termed interfascicular region or medullary ray.
pith Parenchymal tissue in the center of a stem located interior to the vascular bundles.
central cylinder of united vascular bundles in the roots and stems of dicotyledonous seed plants
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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an external rind
an interior filled with pith.
Vascular bundles are scattered through the pith.
Each contains: ...
The core of the central vascular cylinder of monocot roots, consisting of parenchyma cells, which are ringed by vascular tissue; ground tissue interior to vascular bundles in dicot stems.
pituitary gland ...
 See also: Vascular bundle, Plant, Tissue, Cells, Stem
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