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)

At both Sesleria taxa there sprout young intravaginal branches (shoots) even 3 or 4 on a culm - from the 2nd and/or the 3rd leaf sheaths from above of the culms during and immediately after the blooming period. All the senile, i.e. lower, leaves sprout from the stock at both Sesleria taxa. The uppermost - the youngest - leaf springs up from a node, from the top one if there are more than one, the leaf below from the node below, and when the nodes run out all the other leaves sprout from the stock. At Sesleria hungarica the breadth of senile leaves is about the double ofthat at Sesleria heufleriana, in the case of the former about 6 or 7 mm, in that of the latter 2.5 or 3 mm, rarely even 4 mm, as was the case in population 5 in montibus Tornai Karszt. The differences between the two Sesleria taxa are shown in two figures (Figs 4-5). To ensure comparability, all the materials have been taken from their original habitats, three populations having two internodes alike. The differences in measurement are marked, and in addition, the length ratio of the leaf blades and sheaths at Sesleria heufleriana changes in the opposite direction at the second level from above of the youngest leaves, whereas at Sesleria hungarica it takes places only at the third level, as has been mentioned above. The figures also indicate - as has been experienced in practice - that in this stage of development there are two more - partly still measurable - senile leaf vestiges to be found at Sesleria hungarica than in the case of Sesleria heufleriana. Fig. 5. Morphological structure of Sesleria hungarica ÚJHELYI with 2 internodes from original habitat