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There are two types of Stems (Dicots & Monocots)

Dicots like Coleus, have One Ring of Vascular Bundles surrounded by Ground Tissue on both sides.

Monocots like ko & makaloa have Vascular Bundles throughout the Ground Tissue, including the center.

DicotStem-300.gif (14947 bytes) MonocotStem-300.gif (19941 bytes)
Diagrams of Dicot and Monocot Stems. Each is surrounded by an Epidermis (Purple). The Vascular Tissues (Blue) are surrounded by Ground Tissues (Green). The central area of the Dicot Stem does not contain Vascular Bundles.
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Makaloa Stem Section: This is a Monocot. Note the many Vascular Bundles which are spread throughout the Ground Tissues. The light areas are Air Cavities.
StemDiagDicotLab300olhau.gif (29449 bytes) StmDiagMono-2MLabMaKo300.gif (40773 bytes)
Diagram of a Typical Dicot Stem Diagram of a Typical Monocot Stem

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