In experiments carried out in the summer, no sclerenchyma was found in the uppermost 15 cm of the stems. A little sclerenchyma was present on one side of the upper 15–20 cm of the stems. Sclerenchyma was almost absent at the other side of the same stems. In the stem part, 20–40 cm beneath the floral head, considerably more sclerenchyma was found. In this part the sclerenchyma formed a complete cylinder, although on one side of the stem this cylinder was slightly thicker.