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Sjutkina А. V., Gamalei У. V. Effect of temperature on the photoassimilate transport/storage in leaves of the symplasmic species in subarctic zone // Abstr. Inter. Conf. Transp. Assim. Canterbury, Kent, 1995a. P. 24. Sjutkina A. V., Gamalei Y. V. Photosynthesis, photosyntate transport and storage in species of subarctic zone // Abstr. X Photosynthesis Congress. Montpellier, 1995b. Sjutkina A. V., Gamalei Y. V., Pakhomova М. V., Batashev D. R. Location of the cell wall ingrowths in leaf minor veins in relation to the direction of transport fluxes // Abst. X Federation of European Societies of Plant Physiology (FESPP) Congress. Firense (Italy), 1996. P. 178. Young S. B. The vascular flora of St. Lawrence Island with special reference to floristic zonation in the Arctic regions // Contrib. Gray Herb. Harvard Univ. 1971. Vol. 201. P. 11— 115. Yurtsev B. A. Floristic division of the Arctic // J. Veg. Sci. 1994. Vol. 5. N 6. P. 765—776. Ботанический институт Получено 27 IX 1999 им. В. JI. Комарова РАН Санкт-Петербург S UMM A R Y The distribution of the types of terminal phloem in dicotyledonous species from 36 regional and local floras from different regions of Arctic has been studied. The zonal pattern of changes in typological spectra has been observed. The trend of depauperation of flora in northward direction is shown to be connected with the decreasing number of species with advanced types of phloem terminals. It was the same in all longitudinal sectors of the Russian Arctic. The species with primitive types of terminal phloem are typical of the extreme habitats of polar deserts. The present results are discussed with respect to the general tendency of flora and fauna reduction under extreme environmental conditions and preserving most primitive life forms there. 69