The phloem of all species is simply structured. Sieve tubes and parenchyma are not easily distinguishable in cross sections (Fig. 18). The cortex of most species consists of round parenchyma cells (Figs. 19 and 20). Distinct sieve-tube groups exist in the cortex of Aconitum napellus and A. variegatum (Figs. 21 and 22). Sclerenchymatic cells occur only in the cortex of Aconitum lycoctonum. Intercellulares (Figs. 23 and 24) and aer-enchyma (Fig. 25) in the cortex are characteristic of heolphytes and hydrophytes. Only Aconitum napellus has a small phellem
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