http://hdl.handle.net/2115/22025 2017-07-09T21:27:10Z http://hdl.handle.net/2115/60324 Title: Ethylenediurea (EDU) as a protectant of plants against O₃ Authors: Agathokleous, Evgenios; Koike, Takayoshi; Saitanis J, Costas; Watanabe, Makoto; Satoh, Fuyuki; Hoshika, Yasutomo Abstract: Ethylenediurea (EDU) is an anti-ozonant substance that is recognized as a versatile research tool, and　recently attracts increasing interest. As many wild plant species are forced into complex responses by tropospheric ozone (O3), these responses are crucial for the functioning of ecosystems and consequently for the biosphere; thus, countermeasures are required. A plethora of substances have been evaluated as to their effectiveness in protecting plants against O3. EDU is the most widely-used substance in O3 research, in order to moderate O3 effects on plant growth. We present a synoptic table with recent literature on EDU applications to plants as a protectant against O3. This table summarizes important information on these publications, and we hope to be usefull to researchers intended to employ EDU in their research with wild plants, but also to researchers working with air pollution control and other scientists. 2015-11-30T15:00:00Z Agathokleous, Evgenios Koike, Takayoshi Saitanis J, Costas Watanabe, Makoto Satoh, Fuyuki Hoshika, Yasutomo Ethylenediurea (EDU) is an anti-ozonant substance that is recognized as a versatile research tool, and　recently attracts increasing interest. As many wild plant species are forced into complex responses by tropospheric ozone (O3), these responses are crucial for the functioning of ecosystems and consequently for the biosphere; thus, countermeasures are required. A plethora of substances have been evaluated as to their effectiveness in protecting plants against O3. EDU is the most widely-used substance in O3 research, in order to moderate O3 effects on plant growth. We present a synoptic table with recent literature on EDU applications to plants as a protectant against O3. This table summarizes important information on these publications, and we hope to be usefull to researchers intended to employ EDU in their research with wild plants, but also to researchers working with air pollution control and other scientists. http://hdl.handle.net/2115/60323 Title: Wild plant species as subjects in O₃ research Authors: Agathokleous, Evgenios; Saitanis J, Costas; Satoh, Fuyuki; Koike, Takayoshi Abstract: Tropospheric ozone (O3) occurs in high concentrations nowadays and affects a many plant species in Northern hemisphere. Numerous wild plant species are known to be negatively affected by O3, and this may impact biodiversity and ecosystems in near future. Given the importance of O3 research with wild plants, we provide a list of 473 relevant taxa - that have been used as a subject of O3 research - as a research material, under various controlled-environment facilities, along with information about their response to O3. In addition, we include species which have been reported that they had developed ozone-like (but not confirmed) symptoms. This list of taxa along with the references is considered an important database, useful to researchers when planning their relevant investigations. 2015-11-30T15:00:00Z Agathokleous, Evgenios Saitanis J, Costas Satoh, Fuyuki Koike, Takayoshi Tropospheric ozone (O3) occurs in high concentrations nowadays and affects a many plant species in Northern hemisphere. Numerous wild plant species are known to be negatively affected by O3, and this may impact biodiversity and ecosystems in near future. Given the importance of O3 research with wild plants, we provide a list of 473 relevant taxa - that have been used as a subject of O3 research - as a research material, under various controlled-environment facilities, along with information about their response to O3. In addition, we include species which have been reported that they had developed ozone-like (but not confirmed) symptoms. This list of taxa along with the references is considered an important database, useful to researchers when planning their relevant investigations. http://hdl.handle.net/2115/56855 Title: Differences in Pollen Resource Usage and Foraging Periods between the Exotic Bumblebee Bombus terrestris and the Native B. pseudobaicalensis and B. hypocrita sapporoensis in Hokkaido, Japan Authors: Nakamura, Yasuhide Abstract: Bombus terrestris Linnaeus is an exotic bumblebee species that has recently been naturalized in Hokkaido, Japan. Some studies have suggested that the naturalization of this species has caused a decline in the native bumblebee populations. The present study focuses on differences in plant resource usage between coexisting exotic (B. terrestris) and native (B. pseudobaicalensis and B. hypocrita subsp. sapporoensis) bumblebee species in the Ishikari lowland region of Hokkaido. We observed the workers of the three species that came to forage in the investigation area during an approximately five-month period. In addition, we captured some of the bees carrying pollen to analyze the pollen grains attached to their body surfaces. The pollen grains were identified at the genus or species level. Compared with the two native species, B. terrestris workers were relatively abundant during the investigation period. This species also exhibited a relatively long duration of foraging activity and a larger foraging range than the other two native species. The patterns of pollen resource usage were generally different among the three species, suggesting that these species have different flower preferences. Cluster analysis based on use of pollen species by each worker revealed that the cluster compositions overlapped among the three species in July, but this overlap disappeared in August. The usage in pollen species tended to differ through the season. 2013-12-31T15:00:00Z Nakamura, Yasuhide Bombus terrestris Linnaeus is an exotic bumblebee species that has recently been naturalized in Hokkaido, Japan. Some studies have suggested that the naturalization of this species has caused a decline in the native bumblebee populations. The present study focuses on differences in plant resource usage between coexisting exotic (B. terrestris) and native (B. pseudobaicalensis and B. hypocrita subsp. sapporoensis) bumblebee species in the Ishikari lowland region of Hokkaido. We observed the workers of the three species that came to forage in the investigation area during an approximately five-month period. In addition, we captured some of the bees carrying pollen to analyze the pollen grains attached to their body surfaces. The pollen grains were identified at the genus or species level. Compared with the two native species, B. terrestris workers were relatively abundant during the investigation period. This species also exhibited a relatively long duration of foraging activity and a larger foraging range than the other two native species. The patterns of pollen resource usage were generally different among the three species, suggesting that these species have different flower preferences. Cluster analysis based on use of pollen species by each worker revealed that the cluster compositions overlapped among the three species in July, but this overlap disappeared in August. The usage in pollen species tended to differ through the season. http://hdl.handle.net/2115/56854 Title: Tree Shape and Resistance to Uprooting : A Simple Model Analysis Authors: Shibuya, Masato; Koizumi, Akio; Torita, Hiroyuki Abstract: We examined tree resistance to uprooting in relation to tree shape using a simple, qualitative model for the ratio of the resistive moment to the overturning moment. For this analysis, we used model trees and varied the crown size for a fixed stem size for a ratio of crown mass to stem mass that varied from 0.1 to 1. The results predicted the phase transition in the resistance trend in relation to the crown mass/stem mass ratio. Resistance increased on both sides of the crown mass/stem mass ratio, and was minimized at intermediate ratios. This indicates that crown expansion contributes to resistance to the right side of minimum, and vice versa. The same trend was recognized for actual Sitka spruce tree data. These results were consistent with previous observations of tree resistance to uprooting: trees with a small slenderness ratio (ratio of height to diameter at breast height) are resistant to uprooting, and trees/stands are vulnerable to uprooting after thinning, especially after belated thinning. We recommend sparse tree densities in plantations to manage the risk of physical tree damage such as overturning and stem failure. However, quantitative analyses of wind damage to trees and stands are necessary to improve risk management of plantations. The results of this study can be incorporated into such quantitative analyses. 2013-12-31T15:00:00Z Shibuya, Masato Koizumi, Akio Torita, Hiroyuki We examined tree resistance to uprooting in relation to tree shape using a simple, qualitative model for the ratio of the resistive moment to the overturning moment. For this analysis, we used model trees and varied the crown size for a fixed stem size for a ratio of crown mass to stem mass that varied from 0.1 to 1. The results predicted the phase transition in the resistance trend in relation to the crown mass/stem mass ratio. Resistance increased on both sides of the crown mass/stem mass ratio, and was minimized at intermediate ratios. This indicates that crown expansion contributes to resistance to the right side of minimum, and vice versa. The same trend was recognized for actual Sitka spruce tree data. These results were consistent with previous observations of tree resistance to uprooting: trees with a small slenderness ratio (ratio of height to diameter at breast height) are resistant to uprooting, and trees/stands are vulnerable to uprooting after thinning, especially after belated thinning. We recommend sparse tree densities in plantations to manage the risk of physical tree damage such as overturning and stem failure. However, quantitative analyses of wind damage to trees and stands are necessary to improve risk management of plantations. The results of this study can be incorporated into such quantitative analyses. http://hdl.handle.net/2115/56853 Title: Variation on Genotypes and Flowering Characters Affecting Pollination Mechanisms of Sandalwood (Santalum album Linn., Santalaceae) Planted on ex-situ gene Conservation in Yogyakarta, Indonesia Abstract: This research is a part of the long term research on sandalwood improvement strategy based on gene conservation approaches, focused on gene diversity and flowering characteristics of seven sandalwood provenances planted on ex-situ gene conservation in Wanagama Forest Research Station, Yogyakarta Province, Indonesia, and its effect on pollination mechanisms. Juvenile leaves sampled from any individual of each provenance where isozyme analyses then conducted with vertical polyacrilamide gel electrophoresis procedures based on David-Ornstein method with 3 enzyme systems: SHD, EST and DIA. Standard genetic distance measured following Nei and dendrogram then made following cluster analyses based on UPGMA. Parameters of flowering measured daily on each of 10 selected individual based on Ghazoul and Owens methods. Pollination mechanisms investigated by observing the attractant availability provided by 10 marked individual of each provenance. Observation was then made on plant pollinator interactions: stigmatic contact, pollen load, interplant movement, feeding behavior and visitation rate; that were measured daily based on Ghazoul and Jones and Little methods. Provenances originated from same site performed similar genotypes as well as flowering characters. All of provenances were both protandry dichogamy and heterostyly. Variation on size and color of perigonium were found among provenances between times. Generally, provenances originated from Eastern parts of Indonesia flowered earlier compared to those of central parts of Java, with shorter period as well; while those of Bromo was the latest to flower with the longest period. There were 6 types of 3 orders of insect found to visit flowers: moths, butterflies (Lepidoptera), flies (Diptera), ants, bees and wasps (Hymenoptera). Type of insect and visitation rate depended on flowering phases in term of primary (pollen and nectar) and secondary (color of perigonium and mature anthers) attractants availability. Meanwhile, preference of visitors to visit certain provenances was affected more by secondary attractant. 2013-12-31T15:00:00Z This research is a part of the long term research on sandalwood improvement strategy based on gene conservation approaches, focused on gene diversity and flowering characteristics of seven sandalwood provenances planted on ex-situ gene conservation in Wanagama Forest Research Station, Yogyakarta Province, Indonesia, and its effect on pollination mechanisms. Juvenile leaves sampled from any individual of each provenance where isozyme analyses then conducted with vertical polyacrilamide gel electrophoresis procedures based on David-Ornstein method with 3 enzyme systems: SHD, EST and DIA. Standard genetic distance measured following Nei and dendrogram then made following cluster analyses based on UPGMA. Parameters of flowering measured daily on each of 10 selected individual based on Ghazoul and Owens methods. Pollination mechanisms investigated by observing the attractant availability provided by 10 marked individual of each provenance. Observation was then made on plant pollinator interactions: stigmatic contact, pollen load, interplant movement, feeding behavior and visitation rate; that were measured daily based on Ghazoul and Jones and Little methods. Provenances originated from same site performed similar genotypes as well as flowering characters. All of provenances were both protandry dichogamy and heterostyly. Variation on size and color of perigonium were found among provenances between times. Generally, provenances originated from Eastern parts of Indonesia flowered earlier compared to those of central parts of Java, with shorter period as well; while those of Bromo was the latest to flower with the longest period. There were 6 types of 3 orders of insect found to visit flowers: moths, butterflies (Lepidoptera), flies (Diptera), ants, bees and wasps (Hymenoptera). Type of insect and visitation rate depended on flowering phases in term of primary (pollen and nectar) and secondary (color of perigonium and mature anthers) attractants availability. Meanwhile, preference of visitors to visit certain provenances was affected more by secondary attractant. http://hdl.handle.net/2115/53369 Title: Soil-Atmosphere Exchange of CO2, CH4 and N2O in Northern Temperate Forests : Effects of Elevated CO2 Concentration, N Deposition and Forest Fire Authors: KIM, Yong Suk Abstract: Global environmental change and its causes and effects in relation to natural and anthropogenic activity have been the recent focus of concern. An important component of this issue is the role management of soils plays in contributing as a source or sink of greenhouse gases (GHGs), e.g. carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), etc. In forest ecosystems, especially, the production and consumption of these three GHGs are biologically mediated, but also strongly controlled by natural or man-made disturbances and other climate changes influenced environmental variables, e.g. elevated atmospheric CO2 concentrations (Chapter 2), nitrogen (N) deposition (Chapter 3) and fire (Chapter 4). In this study, such environmental changes in forest ecosystems had the potential impacts to change the soil-atmosphere exchange of GHGs. Changes in soil GHG fluxes, furthermore, is that it varied with the environmental changes. Firstly, reduced CH4 consumption with CO2 enrichment was observed with increased levels of soil moisture as a result of increased leaf stomatal closure and evaporative water loss from the forest floor. Secondly, simulated N addition, which was conducted to evaluate the effects of elevated atmospheric N deposition on soil GHG fluxes, inhibited soil CH4 uptake and stimulated soil N2O emission in response to increased inorganic-N concentration. Finally, our low-intensity surface fire reduced soil CO2 flux by the combustion of understory vegetation and litter layer. Especially, soil N2O flux was represented different seasonal pattern, depending on the existence of charcoal. We considered that although increased inorganic-N levels in the burned area as a result of the fire influence preferentially the soil N2O emission, it might be suppressed through net immobilization of NH4 + or interfere with nitrification by fire-produced charcoal. 2013-07-31T15:00:00Z KIM, Yong Suk Global environmental change and its causes and effects in relation to natural and anthropogenic activity have been the recent focus of concern. An important component of this issue is the role management of soils plays in contributing as a source or sink of greenhouse gases (GHGs), e.g. carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), etc. In forest ecosystems, especially, the production and consumption of these three GHGs are biologically mediated, but also strongly controlled by natural or man-made disturbances and other climate changes influenced environmental variables, e.g. elevated atmospheric CO2 concentrations (Chapter 2), nitrogen (N) deposition (Chapter 3) and fire (Chapter 4). In this study, such environmental changes in forest ecosystems had the potential impacts to change the soil-atmosphere exchange of GHGs. Changes in soil GHG fluxes, furthermore, is that it varied with the environmental changes. Firstly, reduced CH4 consumption with CO2 enrichment was observed with increased levels of soil moisture as a result of increased leaf stomatal closure and evaporative water loss from the forest floor. Secondly, simulated N addition, which was conducted to evaluate the effects of elevated atmospheric N deposition on soil GHG fluxes, inhibited soil CH4 uptake and stimulated soil N2O emission in response to increased inorganic-N concentration. Finally, our low-intensity surface fire reduced soil CO2 flux by the combustion of understory vegetation and litter layer. Especially, soil N2O flux was represented different seasonal pattern, depending on the existence of charcoal. We considered that although increased inorganic-N levels in the burned area as a result of the fire influence preferentially the soil N2O emission, it might be suppressed through net immobilization of NH4 + or interfere with nitrification by fire-produced charcoal. http://hdl.handle.net/2115/53368 Title: Yield of Larix sukaczewii Dyl. and Larch Hybrids in Northern Scandinavia Authors: LARS, Karlman; OWE, Martinsson; CHRISTER, Karlsson; GISLE, Skaaret Abstract: Yield of bulk collected provenances of Larix sukaczewii was compared to first generation Russian larch hybrids and three other tree species native to Scandinavia. The hybrids were full sib families of selected European and Russian larch (L. decidua x L. sukaczewii) or Japanese and Russian larch (L. kaempferii x L. sukaczewii). Two provenances of L. sukaczewii were compared. The results after 50 years show that the provenance from Arkhangelsk produced more volume and had better height growth on five of six sites in northern Sweden compared to a provenance from the central Ural Mountains, Sverdlovsk. The hybrid L. decidua x L. sukaczewii which is present in two of the sites have produced 24-71% more stem volume than the best growing pure Russian larch provenance. The dominant height was between 29 and 30.5 meter at the age 51 in the two best growing hybrids. This is between 5 and 6.5 m taller than the expected dominant height for Norway spruce (Picea abies) grown on farm land at the same age. The volume production could be overestimated due to edge effects but indicate a very high production potential in these hybrids. In a 40 year old species trial in central Sweden yield of L. sukaczewii was compared to four other species (Larix decidua, Pinus sylvestris, Picea abies, and Betula pendula). L. decidua showed best volume production of the compared species. L. sukaczewii was second best with a mean growth that was significantly higher than that of Norway spruce and silver birch. A comparison of the yield of the Raivola larch provenance (L. sukaczewii) growing at two sites, one with a strong maritime influence at Lat. 67°04´ N and the other site located in a local continental climate at Lat. 60°54´ N, reveal a very wide ecological niche in this provenance. 2013-07-31T15:00:00Z LARS, Karlman OWE, Martinsson CHRISTER, Karlsson GISLE, Skaaret Yield of bulk collected provenances of Larix sukaczewii was compared to first generation Russian larch hybrids and three other tree species native to Scandinavia. The hybrids were full sib families of selected European and Russian larch (L. decidua x L. sukaczewii) or Japanese and Russian larch (L. kaempferii x L. sukaczewii). Two provenances of L. sukaczewii were compared. The results after 50 years show that the provenance from Arkhangelsk produced more volume and had better height growth on five of six sites in northern Sweden compared to a provenance from the central Ural Mountains, Sverdlovsk. The hybrid L. decidua x L. sukaczewii which is present in two of the sites have produced 24-71% more stem volume than the best growing pure Russian larch provenance. The dominant height was between 29 and 30.5 meter at the age 51 in the two best growing hybrids. This is between 5 and 6.5 m taller than the expected dominant height for Norway spruce (Picea abies) grown on farm land at the same age. The volume production could be overestimated due to edge effects but indicate a very high production potential in these hybrids. In a 40 year old species trial in central Sweden yield of L. sukaczewii was compared to four other species (Larix decidua, Pinus sylvestris, Picea abies, and Betula pendula). L. decidua showed best volume production of the compared species. L. sukaczewii was second best with a mean growth that was significantly higher than that of Norway spruce and silver birch. A comparison of the yield of the Raivola larch provenance (L. sukaczewii) growing at two sites, one with a strong maritime influence at Lat. 67°04´ N and the other site located in a local continental climate at Lat. 60°54´ N, reveal a very wide ecological niche in this provenance. http://hdl.handle.net/2115/53367 Title: Seed and Cone Characteristics of Scots pine (Pinus sylvestris L.) from Diverse Seed Sources in Northern Mongolia Authors: UDVAL, Bayarsaikhan; BATKHUU, Nyam-Osor Abstract: The objective of this study was to determine the variation of seed and cone characteristics of Scots pine (Pinus sylvestris L.) from different seed collection sites in the Tujiin nars region of the Selenge province in Northern Mongolia. The cones and seeds of P. sylvestris showed significant differences in size and color. There were three major groups in seed coat color, black, brown and light, respectively, that were tested for seed quality. Seed quality was examined by the weight of 1000 seeds, germination energy, and germination capacity. Study results showed considerable disparities in seed quality among the seed color groups. At 92.3 percent, germination of black colored seeds was higher than brown (81.2 percent) and light (60.7 percent) colored seeds. Based on weight of 1000 seeds, average weight of black colored seed was 7.2 g while the weight of brown and light colored seed was 6.4 g and 5.7 g. The highest seed germination energy was observed in the black colored seeds 78.7 percent, and then brown colored seeds 74.3 percent, the lowest germination energy were in light colored seed 46.0 percent, respectively. These findings suggest that seed color group can be considered as one of the crucial indicators for selecting qualified seeds. 2013-07-31T15:00:00Z UDVAL, Bayarsaikhan BATKHUU, Nyam-Osor The objective of this study was to determine the variation of seed and cone characteristics of Scots pine (Pinus sylvestris L.) from different seed collection sites in the Tujiin nars region of the Selenge province in Northern Mongolia. The cones and seeds of P. sylvestris showed significant differences in size and color. There were three major groups in seed coat color, black, brown and light, respectively, that were tested for seed quality. Seed quality was examined by the weight of 1000 seeds, germination energy, and germination capacity. Study results showed considerable disparities in seed quality among the seed color groups. At 92.3 percent, germination of black colored seeds was higher than brown (81.2 percent) and light (60.7 percent) colored seeds. Based on weight of 1000 seeds, average weight of black colored seed was 7.2 g while the weight of brown and light colored seed was 6.4 g and 5.7 g. The highest seed germination energy was observed in the black colored seeds 78.7 percent, and then brown colored seeds 74.3 percent, the lowest germination energy were in light colored seed 46.0 percent, respectively. These findings suggest that seed color group can be considered as one of the crucial indicators for selecting qualified seeds. http://hdl.handle.net/2115/53366 Title: Raman and Infrared Spectroscopic Marker Bands for Rapid Detection of Cyanomaclurin Authors: SHIBUTANI, Sakae; YAMAUCHI, Shigeru; KOIZUMI, Akio Abstract: Methanol extracts from Artocarpus heterophyllus, which is a tropical polyphenol-rich tree species, were separated by column chromatography and six fractions were obtained as powder. Raman and infrared (IR) spectra of all the fractions were recorded, and it was found that cyanomaclurin, which was one of the fractions and a flavonoid available for biomedical research, showed two characteristic Raman and IR bands in the 750-700 cm-1 wavenumber region. These spectroscopic results show the high potential of these vibrational bands as a marker for rapid detection of cyanomaclurin. 2013-07-31T15:00:00Z SHIBUTANI, Sakae YAMAUCHI, Shigeru KOIZUMI, Akio Methanol extracts from Artocarpus heterophyllus, which is a tropical polyphenol-rich tree species, were separated by column chromatography and six fractions were obtained as powder. Raman and infrared (IR) spectra of all the fractions were recorded, and it was found that cyanomaclurin, which was one of the fractions and a flavonoid available for biomedical research, showed two characteristic Raman and IR bands in the 750-700 cm-1 wavenumber region. These spectroscopic results show the high potential of these vibrational bands as a marker for rapid detection of cyanomaclurin. http://hdl.handle.net/2115/53365 Title: Overview of the Study of the Genus Myricaria Desv. in Siberia Authors: LYAKH, Elena M. Abstract: Myricaria is a shrub. it grows on pebble, and rocky banks of the mountainous rivers in the southern regions of Siberia. The academician P.S. Pallas was the first who became interested in Myricaria plants when traveling in the mountains of South Siberia. C.L. Willdenow (1816), C.G. Ehrenberg (1827), A.A. Bunge (1835), K.J. Maximovich (1889), S.G. Gorshkova (1949) and other scientists studied the species of this genus. E.G. Bobrov (1967) made the first review of this genus. A detailed analysis of literature and herbarium specimens of the Siberian species of the genus Myricaria was performed. There is no consensus on taxonomy of Siberian species of this genus in botanical literature. Therefore, study of moot points in taxonomy of these species on the basis of an analysis of characters for treatment of the genus Myricaria is of great importance. The features are: size and shape of leaves, peculiarities of structure and size of inflorescences. The author collected plants in the southern Siberia: in the Altay Mountains, Tyva, Pribaikalye and Zabaikalye during expeditions from 1990 to 2006. Also we collected seeds and cuttings of species of Myricaria and grew up them in the nursery of the Laboratory of Dendrology, SB CSBG RAS. When studying of morphological features forming the basis for description of the species, it has been established that only two species: M. bracteata and M. longifolia, instead of four from the botanical literature, grow in Siberia. Differences in the biological peculiarities and areas also are characteristic of the two species. The author does the critical overview and offers system of the Siberian species of the genus Myricaria. 2013-07-31T15:00:00Z LYAKH, Elena M. Myricaria is a shrub. it grows on pebble, and rocky banks of the mountainous rivers in the southern regions of Siberia. The academician P.S. Pallas was the first who became interested in Myricaria plants when traveling in the mountains of South Siberia. C.L. Willdenow (1816), C.G. Ehrenberg (1827), A.A. Bunge (1835), K.J. Maximovich (1889), S.G. Gorshkova (1949) and other scientists studied the species of this genus. E.G. Bobrov (1967) made the first review of this genus. A detailed analysis of literature and herbarium specimens of the Siberian species of the genus Myricaria was performed. There is no consensus on taxonomy of Siberian species of this genus in botanical literature. Therefore, study of moot points in taxonomy of these species on the basis of an analysis of characters for treatment of the genus Myricaria is of great importance. The features are: size and shape of leaves, peculiarities of structure and size of inflorescences. The author collected plants in the southern Siberia: in the Altay Mountains, Tyva, Pribaikalye and Zabaikalye during expeditions from 1990 to 2006. Also we collected seeds and cuttings of species of Myricaria and grew up them in the nursery of the Laboratory of Dendrology, SB CSBG RAS. When studying of morphological features forming the basis for description of the species, it has been established that only two species: M. bracteata and M. longifolia, instead of four from the botanical literature, grow in Siberia. Differences in the biological peculiarities and areas also are characteristic of the two species. The author does the critical overview and offers system of the Siberian species of the genus Myricaria.