Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)

Szujkó-Lacza, J.: Revision of three Astragalus taxa (Leguminosae) and their cenological relations

This difference among the seven samples is reflected in Fig. 4 apllied the SOKAL-MICHENER (I.e.) similarity method. At the lower first quartile of the dendrogram the samples are in four groups. Similarity among the six samples reach only a little more than half size of dendrogram, but the sample No. 1 remained isolated. The samples No. 2-3 and 4-5 and 6-7 are similar (Fig. 4) due to the applied method considering the presence (Table 5) and absence of common species, too. Regarding the coverage values of the samples species are less similar according to HUMMON index (Fig. 5). Because the number of common species in sample pairs is low (Table 5) and the similarity (Figs. 4-5), we can conclude that the Astragalus exscapus and A. e. var. caulifer do not have close affinity to each or to other communities studied by us. These assotiations are together in a higher unit (Festucetea) cenosystematically. Almost independent from the diversity of samples floristical point of view (Tables 3-4). They must two common characters: one or other Festuca taxa should be and the relative tallgrasses (steppe) species occur together in dry circumstance. According to the results it may be supposed that the community structure

—refering to the tallgras — and the development of the pedicellate variety of the Astragalus exscapus are in connection with each other. Summary — The lecto- or more probable the holotype of the Astragalus exscapus L. var. caulifer BORB. emend. SZL. had been found in the herbarium of Botany Department BP. The three Astragalus taxa differ from each other in different number of qualitative and quantitative characters (attributes). Affinity of Astragalus exscapus and A. e. var. caulifer to the relative tallgrasses communities is higher than considering the floristical composition and coverage values (Figs. 4-5) than it was believed earlier. But the structure of these communities and the pedicellate variety of the Astragalus exscapus may be in some connection with each other. * * * Acknowledgements — Author gratefully acknowledge MR. MIKLÓS RAJCZY for computer Programm. MRS. MARGIT BALLA, MRS. ZSUZSANNA HATTYÁR-HIDAS and MRS. ILONA LENGYEL for their technician help. References BECK DE MANNAGETTA, G. (1903): Leguminosae In: Icones Florae Germaniae et Helveticae-Vol. 22. 230 pp. 4-Table 272. Ed. by Reichenbach L. and Reichenbach H. G. Lipsiae et Gerae Zezschwitz. BORBÁS, V. (1885a): Floristische Mitteilungen. — Ö.B.Z., 35: 232-233. BORBÁS, V. (1885b): Új félcserje homokpusztáinkon. — Erdészeti Lapok, 3: 302-304. BRAUN-BLANQUET, J. (1964): Pflanzensoziologie. — Wien-New York, 4th ed. BUNGE in: BOISSER, E. (1872): Flora Orientalis sive Enumeratio Plantarum in Oriente II. Lugduni, Genevae et Basilea BUNGE, A. (1868-69): Generis Astragali species gerontogaeae. — Mém. Acad. Petropoli (Lipsiae. Voss.), 4: 140-254. CHATER, A. O. (1968): Astragalus L. In: Flora Europae Vol. 2. Rosaceae to Umbelliferae 108-124, Cambridge. University Press. CZEKANOWSKI, J. (1909): Zur differential Diagnose der Neandertalgruppe. — Korsespubl. Dt. Ges. Anthrop., 40: 44-47. DECANDOLLE, A. P. (1802): Astragalogia Nempe Astragali, Biserulae et Oxytropidis, nec non Phacae, Colutea et Lessertiae —- Históriáé Iconibus Illustrate, Parisiis, J. B. Garnery. HARGITAI, Z. (1937): Nagykőrös növényvilága I. A flóra. — Debrecen, A Debreceni Református Kollégium Tanárképző Intézetének Kiadása. HARGITAI, Z. (1940): Nagykőrös növényvilága II. A homoki növényszövetkezetek. Die Vegetation von Nagykőrös II. Die Sandpflanzengesellschaften. — Bot. Közi, 37: 205-240.