Virgiia young stem, TS
The Virgilia stem shown at left, is
very similar to that of the TS of the young
Bidens stem. The epidermis (E) , consists of a
single layer of cells, and beneath this is a hypodermal layer, composed
single row of chlorenchymatous cells.
band of sclerenchymatous perivascular fibers (PV) just
beneath the starch sheath (SS).
Vascular bundles (VB) are entirely primary.
Virgilia looks a lot like Bidens except that Bidens lacks perivascular fibers. Another example of a plant that contains a ring of conspicuous sclerenchymatous perivascular fibers exarch to the vascular bundles is Pelargonium.