Flowering plants - Stem
Dicot stem cross section (Ranunculus), viewed at low power:

A - epidermis
B - vascular bundle
C - pith
D - cortex

C + D = ground tissue (parenchyma)
Vascular bundle in dicot stem cross section (Ranunculus), viewed at high power:

A - xylem tissue
B - phloem tissue
C - fibers
Monocot stem cross section (Zea), viewed at low power:

A - vascular bundle
B - ground tissue (neither pith nor cortex, since there is no ring of vascular bundles to separate inner and outer layers of parenchyma)
Vascular bundle in monocot stem cross section (Zea), viewed at high power:

A - phloem tissue
B - xylem tissue
 
All photos by Robert Bowker
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