Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 96. (Budapest 2004)

Kováts, D.: Some differences in morphological structure of the vegetative parts (herbage) of Sesleria heufleriana Schur and Sesleria hungarica Ujhelyi (Poaceae)

tion 4) a few (second from above) youngest leaf blades and the next (third from above) youngest leaf blades leave the culms at the same level. At the population collected at Szádvár (population 4) a few third and sixth leaf blades leave the culms at the same level, consequently the lenghts of the leaf sheaths are the same. A few fifth leaf blades leave the culms higher than the blades of the third and sixth leaves, and though they are older than the third and sixth leaves, their leaf sheaths are longer. Such exceptions can be found as compared with the average data. In the foregoing already mentioned population (population 2) from Szarvaskő at Sesleria heufleriana a few older fourth leaves have longer sheaths than the younger third leaves have. Consequently a few older, lower leaf blades leave the culms at a higher level than the younger ones do. Naturally in this case the leaf sheaths of the fourth leaves open for the leaf blades of the third leaves, in order to be able to leave the culms According to DEYL (1946: 8): "Most characteristic is the length of the last culm leaf." I have not found significant differences in the lengths of the last culm leaves between the two closely related Sesleria taxa. According to my measurements the lengths of the blades of the topmost (youngest) leaves are only slightly shorter (2.5 cm) at Sesleria heufleriana than at Sesleria hungarica (3 cm). The same aplies to the leaf sheaths, their lengths being 14 cm and 16 cm on the average at Sesleria heufleriana and Sesleria hungarica respectively. Fig. 4. Morphological sructure of Sesleria heufleriana SCHUR with 2 internodes from original habitat