Aconite napellus is easily mistaken for an edible herb. This sturdy, low-growing
herbaceous perennial is found in gardens and in the wild throughout Europe and the
United States. The spikes of blue flowers give this plant its common name "monkshood"
because the uppermost sepal is shaped like a helmet or a hood. All parts of the plant are
extremely toxic and gardeners should wear gloves anytime they go near it.
Which of the following tissue layers would you not find is this plant?