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)

Table 2. Distribution of culms by internode numbers Sesleria heufl zriana Sesleria h ungarica number of from original from experimental from original from experimental internodes habitats garden habitats garden 1 10/110 = 9% 10/30 = 33% 0 0 2 70/1 10 = 64% 20/30 = 67% 70/110 = 64% 0 3 30/1 10 = 27% 0 30/1 l() = 27

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/r 50/70 = 72% 4 0 0 10/110 = 9% 10/70= 14% 5 0 0 0 10/70= 14% sum % 100 100 100 100 At experimental garden conditions there are significant differences in the number of internodes between the two taxa (measuring 100 specimens from 4 populations). Here in the case of Sesleria heufleriana 33% of the culms have not nodes; 67% of the culms have 2 internodes. In the case of Sesleria hungarica 72% of the culms have 3 internodes, 14% 4 internodes, and 14% even 5 internodes (Fig. 1). In this way at garden conditions there remain culms with 2 internodes in most cases at Sesleria heufleriana, but in contrast with this no culms with 2 internodes or culms without node can be found at S. hungarica. At this taxon culms with 3 internodes are the most frequent, even culms with 4 or 5 internodes are not rare. According to the foregoing observations and measurements it seems that a higher number of internodes is characteristic of Sesleria hungarica especially at garden conditions where the ecological differences are basically eliminated (Fig. 1). In a previous work, similarly to Sesleria, on two taxa of Phleum {Ph. hertolonii DE CANDOLLE = Ph. hubbardii D. KOVÁTS and Ph. pratense LINNAEUS) I found significant differences in the number of internodes especially at garden conditions (KOVÁTS 1976, 1977). Fig. 1. Distribution of culms by internode numbers