| It is a good practice to have Model
Systems for describing complex processes. We will use Coleus and Aristolochia
as models for secondary growth in stems. Coleus is a member of the Lamiaceae and
has square stems. This is convenient because the major vascular bundles occur in the
four corners. Aristolochia is a tropical vine and we have this in our courtyard garden. Aristolochia is also one of the model systems typically used in Plant Anatomy courses. How convenient! |
|
 Cross-section of a young Coleus stem stained with Phloroglucinol. The circles indicate the large vascular bundles in the corners of the stem. |
 Cross-section of a young Coleus stem stained with Phloroglucinol & viewed with crossed Polarizers. |
 Diagram of a mythical Stem like Coleus |
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