Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 69. (Budapest 1977)

Szujkó-Lacza, J. ; Sen, S.: Correlation coefficient study in some character pairs of the Hungarian Gentiana (Gentianaceae)

lated in oposite direction. In 67. asclepiadea there is no pair with significant correlation. The pedicel is a taxonomically important character in Gentiana as it appears to be genetically controlled and under strong regulation of growth regulators so much so that in 67. cruciata and 67. asclepiadea the pedicels are not only long or short but are wholly absent. In two species where it is present it shows significant correlation with other characters. Its absence in the other two species is also an equally important negative character. Although CLIFFORD (I.e.) stresses that the attributes which give significant correlation may be used for clas ification of taxa, in our study we did not find any attribute to be relied upon statistically for separating the four species. References CLIFFORD, II. T. (1969): Attribute correlation in the Poaceae (grasses). — Bot. J. Linn. Soc, 62: 59-67. SNEATH, P. H. A. & SOKAL, R. R. ( 1973): Numerical Taxonomy. —San Francisco, Freeman and Co. SOKAL, R. R. & SNEATH, P. H. A. (1963): Principles of numerical taxonomy. —San Francisco-London, Freeman and Co. Sou, R. (1966): A magyar flóra és vegetáció rendszertani-növényföldrajzi kézikönyve. (Synopsis Systematico-Geobotanico Florae Vegetationique Hungáriáé). Vol. 11. — Budapest, Akad. Kiadó, p. 620-622. SVÁB, J. (1967): Biometriai módszerek a mezőgazdasági kutatásban. (Biometrie methods in agricultural research). — Budapest. SZUJKÓ-LACZA, J. & S. SEN (1976): Numerical evaluation of phenotypic relationship among Hungarian species of Gentiana. — Acta Bot. Hung., in print. Address of authors: DR. JÚLIA SZÜJKÓ-LACZA Botanical Department Hungarian Natural History Museum H-1146 Budapest, Vajdahunyadvár Hungary DR. SUBIR SEN Botanical Department Serampore College Hoogly, West Bengal India