Zs. P. Komáromy szerk.: Studia Botanica Hungarica 12. 1977 (Budapest, 1977)
Szujkóné Lacza, Júlia; Sen, Subir: Distribution, diversity and equitability of the Hungarian species of Gentiana and Gentianella ciliata L. (Gentianaceae)
species of other families. The developmental stadia whithin the life cycle of a species is genetically controlled in correspondance with environmental factors. It was experimentally illustrated amply by CLAUSEN, KECK and HIESEY (1940) in the case of coastal ecotypes of Potentilla glandulosa . They showed that a particular sample of plant (ecotypes) planted at different altitudes shows variation in flowering time according to altitude. The higher altitude plants start flowering a little later than those of lower altitude. In Tables 4 and 5 for diversity in relation to flowering time, minimum value of diversity is seen in G. asclepiadea. Then next in order are G. cruciata and G. ciliata. Maximum diversity is observed in G. pneumonanthe . For equitability the maximum values are found in G. ciliata and G. pneumonanthe , G. cruciata and G. asclepiadea . G. ciliata flowers maximum in September and has the highest equitability. From the high equitability value and morphological behaviour of G. ciliata and G. pneumonanthe . it may be concluded that they posses a direct genetical control for the flowering phase of their life cycle. The lower equitability in G. asclepiadea and G. cruciata in the flowering time may be connected to their morphological features described above and therefore may be regarded to be under indirect genetic control. Table 6 for the equitability of the four species with reference to the maximum diversity in factor gradient and flowering time reveals that here again G. cruciata shows maximum equitability in relation to altitude, while G. ciliata the minimum. For precipitation, G. cruciata shows the maximum equitability as before but the value of G. ciliata is also very near to it. In the case of habitat, maximum equitability is observed in G. asclepiadea and minimum in G. cruciata . For flowering time the highest value is seen in G. pneumonanthe and the lowest is G. asclepiadea . However, individually equitability in relation to flowering time was found to be highest in G. ciliata (Table 5). Considering the diversity and equitability of the individual species in relation to the different factor gradients and frequency of flowering (Table 5) gives the following result. In G. asclepiadea, maximum diversity and equitability is observed for the habitat factor, while minimum for flowering time. It also shows the highest relative equitability in the same factor (Table 6). In the case of G. cruciata , maximum diversity is found in altitude and then in precipitation, while the minimum in habitat. This species shows equal and highest values of equitability and relative equitability (Table 6) in the altitude factor, while the lowest in flowering time. G. pneumonanthe , like G. cruciata also shows the highest diversity in altitude and precipitation factors and the lowest in habitat.
