Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 75. (Budapest 1983)

Kováts, D.: Distribution of internode lengths of two Lithospermum species (Boraginaceae)

many shoots in most cases are very rare. Naturally this statement needs to be substantiated by many measurements — first of all in original places — to make it a definite statement on specimens with known age as the distribution of shoot number depends mostly on the ages of the specimens (more shoots grow from old and welldeveloped rhizomes). Comparison of the measurement data in an other context was also made (1. Table). The numbers of stoloniferous shoots and flowering shoots are taken into consideration separately for each specimen and grouped accordingly. What is immediately striking is that in most of the cases one specimen has one stoloniferous shoot and one flowering shoot (in the ratio of 1:1). One-third of the measured material are like this, in agreement with the former comparison. There are much fewer number of specimens which have two stoloniferous shoots and one flowering shoot (2:1). The following ratios are given in order of frequency: 1:2, 0:2 (having only 2 flowering shoots), 3:1. This kind of specimens comprised the other one-third of the measured material. According to the tendency we have seen in the comparison above, specimens which have many shoots are rare. Especially rare are the specimens having several stoloniferous shoots and at the same time several flowering shoots too (1. Table). Further ratios of shoot numbers are the following: 2:2, 3:2, 2:3, 1:3, 4:1. The following ratios of shoot numbers were found only once during the measurements: 1:0, 2:0, 3:0, 0:3, 4:0, 4:2. 2:4, 3:4.2:5, 3:5 5:4. It is interasting that among the measured 84 specimens are 7 specimens (part of 1/12) which have only 2 flowering shoots without stoloniferous shoots. It seems to be contradict the observation that Lithospermum purpureo-coeruleum L. reproduces itsclfs only in vcgetatively under Hungary's climate. The internode lengths of stoloniferous shoots of Lithospermum purpuero-coeruleum L. It may be easily seen that the internode lengths greatly fluctuate. Curve S (TROLL 1937) seems to be the most frequent one in the cases by using the most common graphical method for representing Fig. 3. Distribution of internode lengths of four, one-year old flowering shoots of Lithospermum arvense L. (curves with one maxima)