В статье рассматривается история и современное состояние старейших экземпляров дуба черешчатого (Quercus robur L.) – важнейшего вида деревьев для лесного и садово-паркового хозяйства Санкт-Петербурга и пригородной зоны. Анализируются представители данного вида, произрастающие вблизи северной границы своего ареала и являющиеся крупнейшими и старейшими среди деревьев местной флоры в Санкт-Петербурге и его окрестностях. На северном побережье Финского залива сохраняются очень старые и крупные дикорастущие деревья дуба черешчатого в пределах городской черты, возраст которых превышает возраст основания Санкт-Петербурга. Например, дерево у посёлка Лисий Нос, возраст которого авторы статьи оценивают не менее чем 450 лет. Отмечается ухудшение состояния дуба черешчатого, в связи с чем актуально создание базы данных по старым сохранившимся деревьям и принятие мер по продлению жизни каждого уникального дерева. The article presents the history and current state of the oldest specimens of English oak (Quercus robur L.) – the most important tree species for forestry, and gardening in St. Petersburg and its suburban area. The authors analyze representatives of this species that grow near the northern borders of their range and are the largest and oldest among the trees of the local flora in St. Petersburg and its environs. On the northern coast of the Gulf of Finland, very old and large English oak trees are preserved, growing wild within the city limits, which appeared even before the founding of St. Petersburg. For example, a tree near the village of Lisiy Nos, the age of which the authors of the article estimate to be no less than 450 years. There has been a deterioration in the condition of the Quercus robur, and therefore it is important to create a database of old surviving trees and take measures to extend the life of each unique tree.

В начале XXI в. в Санкт-Петербурге заметно увеличилось число видов деревьев и кустарников, перешедших в репродуктивное состояние. У целого ряда из них впервые за длительный период интродукции было получено семенное потомство. В таких условиях, когда так заметно меняются уровни адаптированности и по-разному проявляются биологические особенности разных видов растений, несомненно, возрастает роль и значение ведения и обработки длительных рядов непрерывных фенологических наблюдений. За период непрерывного фенологического мониторинга (1980-2022 гг.) в Ботаническом саду Петра Великого Ботанического института им. В. Л. Комарова РАН установлено, что на фоне потепления климата Санкт-Петербурга, начавшегося с конца 1980-х годов, биологическая цикличность, по Н. Е. Булыгину, проявляется в чередовании раннетеплых (1989, 1990, 1992, 1995, 2007, 2008, 2014, 2015, 2016, 2019, 2020, 2022 гг.) и позднехолодных (1980, 1982, 1985, 1987, 1996, 1998, 2003, 2004, 2006, 2011, 2012, 2013 гг.) лет, что отражается на репродуктивной активности древесных растений и на способности их пережить зимние условия. За 2001-2022 гг. в репродуктивное состояние вступили 238 видов, многие из которых до этого в течение десятилетий находились в вегетативном состоянии. Особенно заметно улучшение в репродуктивной сфере растений после аномально теплой зимы 2006/07 г., оно усилилось в 2015 г. Этот и 2020 г. стали самыми теплым за период инструментальных метеорологических наблюдений. 50.8 % случаев вступления в первое цветение и плодоношение приходится на раннетеплые годы и только 16.4 % случаев - на позднехолодные. При подведении итогов интродукции и оценке перспективности для разведения древесных растений для урбанофлористики необходимо учитывать цикличность климата региона, сезонный ритм развития растений и их ритмоадаптивные связи. At the beginning of the 21st century in St. Petersburg, the number of species of trees and shrubs that have entered a reproductive state has noticeably increased. A number of them produced seed offspring for the first time over a long period of introduction. In such conditions, when the levels of adaptation change so noticeably and the biological characteristics of different plant species manifest themselves differently, the role and importance of conducting and processing long-term series of continuous phenological observations undoubtedly increases. During the period of continuous phenological monitoring (1980-2022) in the Botanical Garden of Peter the Great Komarov Botanical Institute Russian Academy of Sciences established that against the backdrop of climate warming in St. Petersburg, which began in the late 1980s, biological cyclicity, according to N. E. Bulygin, manifests itself in the alternation of early warm periods (1989, 1990, 1992, 1995, 2007, 2008, 2014, 2015, 2016, 2019, 2020, 2022) and late cold years (1980, 1982, 1985, 1987, 1996, 1998, 2003, 2004, 2006, 2011, 2012, 2013), which is reflected on the reproductive activity of woody plants and their ability to survive winter conditions. For the period 2001-2022 238 species entered the reproductive state, many of which had previously been in a vegetative state for decades. The improvement in the reproductive sphere of plants is especially noticeable after the abnormally warm winter of 2006/07; it intensified in 2015. This year and 2020 became the warmest during the period of instrumental meteorological observations in St. Petersburg. 50.8 % of cases of the first flowering and fruiting occur in early warm years; and only 16.4 % of cases - in late cold years. When summing up the results of introduction and assessing the prospects for breeding woody plants for urban floristics, it is necessary to take into account the cyclical climate of the region, the seasonal rhythm of plant development and their rhythm-adaptive connections.

  БИОЛОГИЧЕСКИЕ НАУКИ  УДК 581.2 ПАТОГЕННЫЕ МИКРОМИЦЕТЫ У ПРЕДСТАВИТЕЛЕЙ СЕМЕЙСТВА SALICACEAE, ИНТРОДУЦИРОВАННЫХ В БОТАНИЧЕСКОМ САДУ ПЕТРА ВЕЛИКОГО 1 Трофимова А.С., 1 Яндовка Л.Ф., 2 Фирсов Г

The article discusses the dynamics of the onset of phenological stages in 2022 and the features of the seasonal development of woody plants in the Botanical Garden of Peter the Great, depending on the weather conditions of winter and the subsequent growing season. The winter 2021/22 was normal on its duration (105 days) and comparatively mild. The coldest month was December (-7,5), with absolute minimum -23,1(26 December), not reaching the figures observed in the past (-34,7 ...10 January 1987). The frost damages of majority of trees and shrubs was absent or small, not more than half of annual growth. The peculiarity of season of 2022 was abnormally warm weather of the second half and the end of summer, with hot temperature in August: 20,6. This is the record for the whole period of instrumental meteorological observations since 1752. In such conditions the Autumn began as late as on the 10-th of September which is the record during 43-years monitoring since 1980. Apparently the warming of the climate of Saint-Petersburg is continuing and strengthening The autumnal season has the tendency to more late beginning and to enlarging of its duration. In such conditions the assortment of trees and shrubs promising on its winter hardiness for culture at the North-West of Russia is enlarging. There are more and more plants which were considered to be subtropical and indoor only, but nowadays successfully are winter hardy, produce flowers and fruits and may be successfully cultivated outdoor.

The abnormally warm and dry summer was the main feature of the year 2021. The average temperature of June (21,4) was the record for the whole period of instrumental meteorological observations since 1752. The phenological anomalies were evident first of all in the early dates of phenostages of the year, since the third stage of subseason "Height of Spring" till the first stage of subseason "Abatement of Summer", and especially very early dates of subseason of "Full Summer", which became the record or close to record ones. So, the warming of the climate of Saint Petersburg is continuing and strengthening. In such condition after the winter 2020/21 the majority of trees and shrubs in Peter the Great Botanic Garden (Saint Petersburg, Russia) survived the winter without damages or with small damages not more than half of annual growth. The summer drought, accompanied by hot weather, caused the early yellowing and falling of leaves on many trees and shrubs which happened to be not hardy to drought. The phenological monitoring and timely publishing of results of observations is of important significance in conditions of climatic changes.

The Japanese Elm (Ulmus japonica (Rehd.) Sarg.) has been tested at Peter the Great Botanic Garden since 2000, and it has reached the size of a well developed single-trunk tree, 11 m high, at the age of about 25 years old. The first fruiting was observed in 2014 at the age of about 17 years. The first seed reproduction was obtained in 2021, with germination power 20,3-24,7 %. The height of seedlings of the first year reaches 128-162 mm on average, with maximum height up to 295-340 mm. This species is one of the most stable to Dutch elm disease and is promising for cultivation and for restoration of Elm’s population in Saint-Petersburg.

Background. Comparative palynomorphological studies of naturally occurring and introduced Pterocarya Kunth representatives reveal the taxonomic significance of pollen morphological features and pollen characters of cultivated plants. The quality of pollen material and the potential of the plants from the Botanical Garden of BIN RAS for introduction are characterized.Materials and methods. Pollen grains were investigated using light, confocal laser scanning and scanning electron microscopes. Fertility was assessed using the standard acetocarmine method.Results. Comparison of pollen morphology in cultivated and naturally growing plants of this genus was made for the first time. Pollen fertility of two cultivated species (Pterocarya rhoifolia Siebold et Zucc., and P. stenoptera DC.) was very high, generally over 90%. Fertility of P. fraxinifolia (Lam.) Spach grains varied from 28 to 73% in different years, which is a low or medium level of pollen quality. Morphologically, pollen grains of all 12 specimens from five taxa are flattened, medium sized, 21–45 μm in diameter, with 4–8 pores; pores are located mainly at or near the equator. The pores are round or oval, with a limbus. Exine is three-layered, thickened near the pore. The sculpture is microechinate. The low-fertile P. fraxinifolia specimen contains small pollen grains, as well as grains in tetrads and dyads. The data on the introduction of the genus in St. Petersburg are presented.Conclusion. The palynonomophological description is diagnostic for the genus Pterocarya. The Pterocarya pollen is well distinguishable from other wind-pollinated taxa; however, species identification by pollen for spore-pollen analysis is not practicable. Morphologically, the most diverse are the grains of the low fertile specimen P. fraxinifolia. The limited possibility of seed propagation of P. fraxinifolia is probably explained by low pollen fertility. The pollen quality of the introduced P. rhoifolia and P. stenoptera is high.

A new form, Salix ledebouriana f. fastigiata I. V. Belyaeva, V. V. Byalt, O. V. Epanch. et Firsov, is described and its characteristics in cultivation in Yekaterinburg and St. Petersburg are given.

Pozdnyakov’s mountain ash Sorbocotoneaster pozdnjakovii Pojark. is a hybrid genus with a single species that arose from spontaneous hybridization of Cotoneaster melanocarpa Lodd. × rowan Sorbus sibirica Hedl. (Rosaceae), endemic to the flora of Russia. In the Peter the Great Botanical Garden Botanical Institute of the Russian Academy of Sciences it is known since 1953, from locus classicus of the natural provenance. The seed reproduction of the second generation was obtained for the first time in 2010. The germination ability was low 4–14 %. In natural conditions the species grows in sharply continental climate. There are cases of the rotting of plants soaking and destruction of plants from Phytophthora in the Saint-Petersburg’s the Peter the Great Botanical Garden at the end of the 1980’s. Under conditions of noticeable climate warming, it is necessary to do uninterrupted phenological observations, monitor the disease resistance, to develop agrotechnical cultivation maps.

Опыт интродукции деревьев и кустарников в Санкт-Петербурге показал, что особенно опасны для растений очень холодные, критические зимы, они и являются главным фактором отбора. В 20 столетии в Санкт-Петербурге можно выделить 31 холодную зиму. Большая часть их имела место в начале века. Если в первой половине столетия таких зим насчитывается 21, то во второй половине – только десять. Зима 1941/42 г. с суммой температур в холодную часть года – 1800 о оказалась рекордно холодной не только в 20 веке, но и за весь период инструментальных наблюдений с 1752 г. Зимой 1939/40 г. (–1310 о) в Санкт-Петербурге зарегистрирован абсолютный минимум температуры воздуха (17 января 1940 г.: –35,6 о). Последней суровой зимой, оказавшей заметное влияние на интродуцированную дендрофлору, была зима 1986/87 г., зимы конца столетия были преимущественно тёплыми и нормальными. В современных условиях потепления климата меняются уровни адаптированности древесных растений. Ранее опубликованные данные по зимостойкости древесных экзотов на Северо-Западе России нуждаются в ревизии. Если в 20 веке первостепенное значение имело изучение зимостойкости и реакции древесных интродуцентов на суровые зимы, то сейчас требуются комплексные многоплановые исследования уровней адаптированности, устойчивости и долговечности растений в ботанических коллекциях. Важно выделить группы растений, по-разному реагирующие на изменения климата. The experience of arboriculture at Saint-Petersburg shows that abnormally cold winters are especially dangerous for trees and shrubs. In fact, they are the main factor of selection. There were 31 cold winters at Saint-Petersburg in the 20-th century. The majority of them happened to occur at the beginning of that century. There were 21 of such cold winters in the fi rst half of the 20-th century, and only 10 – in the second half of it. The winter 1941/42 with sum of temperatures during the cold period of the year ... -1800 о was in fact the record one not only in the 20-th century, but during the whole period of instrumental meteorological observations since 1752. The absolute minimum temperature at Saint-Petersburg (–35,6 о оn 17 January 1940) was registered in winter 1939/40 (–1310 о). The last severe winter of strong influence on introduced woody flora was the winter 1986/87. In general the winters at the end of the 20-th century were mostly warm and normal ones. In modern conditions of the warming of the climate the levels of adaptation of woody plants have been changing. The earlier published data on winter hardiness of woody exotic species at the North-West of Russia need to be revised. In the 20-th century the investigation of winter hardiness and of reaction of woody plants on hard winters were of first grade interest. But nowadays the united complex research of different levels of adaptation, of steadiness and longevity are required. This is of importance to develop groups of plants which have different reaction on the warming of the climate.

В Нижнем и Верхнем дендрологических садах Санкт-Петербургского государственного лесотехнического университета в Санкт-Петербурге выращивается 13 видов и 1 гибрид рода Larix Mill., представленных 124 экземплярами, в возрасте от 25 до 200 лет. Все зимостойки, образуют шишки, 3 вида (L. archangelica, L. decidua, L. sibirica) дают самосев. Всего за период интродукции были испытаны 23 таксона рода Larix, наибольшее число видов здесь впервые испытал Э.Л. Вольф. Некоторые виды (L. komarovii, L. maritima) здесь были впервые введены культуру. В коллекции сохранились старовозрастные экземпляры, посаженные еще в XIX в. – 71 шт., самые старые посадки (9 деревьев) датируются 1820 г. (L. archangelica, L. decidua, L. sibirica). Самое высокое дерево относится к L. sibirica: 34,0 м выс., самое толстое по диаметру ствола – L. decidua: 102 см. Исследования подтверждают важность периодических биометрических измерений и непрерывного мониторинга коллекции. Отдельные деревья заслуживают внесения в базу данных по деревьям-чемпионам по их размерам в высоту и диаметру ствола. There are 13 species and 1 hybrid of genus Larix Mill., represented by 124 trees, in collection of the Upper and the Lower dendrological gardens of Saint-Petersburg State Forest-Technical University, under the age from 25 till 200 years old. All of them are winter hardy and produce cones. Three species (L. archangelica, L. decidua, L. sibirica) give self-sowing. Totally there are 23 taxa which have been tested for the period of introduction. The largest amount of species were tested by E.L. Wolf. Some species (L. komarovii, L. maritima) were introduced here into general cultivation. There are trees of old age planted as early as in the XIX century (71). There are 9 of oldest trees cultivating since 1820 (L. archangelica, L. decidua, L. sibirica). The tallest tree is of L. sibirica: 34,0 m high, the most thick on trunk diameter is the tree of L. decidua: 102 см. The research confirm the importance of periodical biometrical measurements and uninterrupted monitoring of all collection. There are certain trees which deserve to be included into the data base on Champion trees on their sizes.

В современных условиях начала 21 в. интродукция древесных растений в Санкт-Петербурге осуществляется на фоне очень заметного потепления климата. При культуре растений в открытом грунте главным фактором отбора здесь, в подзоне южной тайги, были аномально холодные зимы. За период инструментальных метеорологических наблюдений (1752-2018 гг.) можно выделить 19 таких экстремально холодных зим: шесть – в 18 в., десять – в 19 в. и три зимы (1939/40, 1941/42 и 1955/56 гг.) - в 21 в., при рекордно холодной зиме 1941/42 г. с суммой температур за ноябрь-декабрь ... -1800°. Многие виды деревьев и кустарников можно было культивировать лишь в промежутке между холодными зимами. Число и повторяемость аномально тёплых зим заметно возросло после зимы 1972/73 г. Во второй половине 20 в. насчитывается 10 таких зим, в 21 в. 8 из 18 зим можно отнести к этой категории. Зимой 2013/14 г. сумма температур за ноябрь-март стала из отрицательной положительной (+11°). Пять лет подряд с 2013 г. – это годы с аномально тёплыми зимами, при том, что зима 2017/18 г. – рекордно тёплая за весь период наблюдений ... +132°. Заметно повысились годовая температура (год 2015 стал самым тёплым в истории ... 7,7°) и минимальная температура воздуха (на основе её выделяются зоны зимней устойчивости древесных растений). Резкое удлинение вегетационного сезона в сочетании с более короткой и мягкой зимой повышает зимостойкость и позволяет выращивать в открытом грунте гораздо большее число теплолюбивых видов. С другой стороны, это способствует распространению болезней и вредителей, накоплению инфекции в почве. В таких условиях очень важными становятся непрерывный мониторинг, накопление и обработка длительных рядов непрерывных фенологических и метеорологических наблюдений. Очевидно, что ботанические сады будут играть всё большую роль в сохранении биоразнообразия. In modern conditions of the beginning of the 21 century the cultivation of woody plants at Saint-Petersburg (North-Western Russia) is carried out in conditions of considerable warming of the climate. Here, at the southern taiga subzone, the abnormally severe winters have always been the main factor of selection for outdoor arboriculture. For the whole period of instrumental meteorological observations (1752-2018) this is possible to develop 19 of abnormally cold winters: six in the 18 century, ten – in the 19 century, and there are 3 such winters (1939/40, 1941/42 and 1955/56) in the 21 century, with unique cold winter of 1941/42 with the sum of temperatures for November-March months ... -1800°. This was possible to cultivate many species of trees and shrubs in limits between such cold winters only. The amount and recurrence of abnormally warm winters has considerably arisen since winter 1972/73. There are 10 such warm winters at the second half of the 21 century. And in the 21 century the eight from 18 winters are possible to put into such category. In winter 2013/14 the sum of temperatures for November-March months from negative figures became positive (+11°). And there are 5 years since 2013 which all of them are with abnormally warm winters, with winter 2017/18 being the most warm for the whole period of observations ... +132°. The annual year and the absolute minimum temperatures have considerably arisen (the year 2015 comes to be the warmest one in the history of observations ... 7,7°). The sharp prolongation of vegetative season together with more short and more mild winters promotes to enrich the winter hardiness of plants and let us to cultivate outdoors much more warm loving species. On the other side, this has negative consequences as well, this promotes to distribution of pests and diseases, to accumulation of infection in the soil. In such conditions the uninterrupted monitoring becomes more and more important as well as evaluation and treatment of long rows of the accumulated phenological and meteorological observations. Evidently, the botanic gardens will take more important role in biodiversity conservation in conditions of the changing of the climate.

Metasequoia glyptostroboides Hu et W.C. Cheng has been grown in the Peter the Great Botanical Garden of the BIN RAS since 1952, where it was first introduced into cultivation in Russia. It is the most winter-hardy representative of the Taxodiaceae family suitable for open field culture in St. Petersburg. The best specimens reached 14.4 m in height with a trunk diameter of 29 cm at the age of 69 years. In 2018, seed production was recorded for the first time. Seed offspring were obtained in 2020. In the conditions of the warming of the climate of St. Petersburg in the first two decades of the 21st century, there is a surge in the generative ability of woody exotics, an increasing number of trees and shrubs are beginning to bear fruits and seeds.

Background. The study and mobilization of natural flora species in botanical gardens allow the curators to save biological resources of useful plant species, and recommend them for urban landscaping. In the flora of Russia, one species of a woody vine from the genus Aristolochia L. is A. manshuriensis Kom.; it is included in the Red Data Book of Russia.Methods The material for the study was A. macrophylla Lam. and A. manshuriensis from the collection of the Peter the Great Botanical Garden maintained by the Komarov Botanical Institute of the RAS. Winter hardiness was assessed; plant height, stem diameter, and crown diameter were measured. The sizes and age are given according to the state of the plants in the fall of 2017. Seed quality was assessed with due regard to the approved guidelines. X-ray analysis of fruits and seeds was carried out using the methods developed for the use of microfocus radiography for seeds and fruits.Results. A. manshuriensis has been grown in the Peter the Great Botanical Garden since 1909. The first flowering was observed in 1918 and 1919, the first fruiting in 1924. Currently, plants of the third or fourth generation are present in the collection. A. macrophylla has been known in St. Petersburg since 1816. Over a 200-year period of introduction, only flowering was observed. For the first time, fruiting in this species was registered in 2007; since 2014, second-generation plants have been grown. Analysis of the seeds collected in 2016 and 2017 showed that they are viable and of high quality in both species of Aristolochia. These species are winter-hardy, demonstrate rapid growth, and may somewhat vary in the timeframe of the passage of main phenological phases in their seasonal rhythm of development.Conclusion. For laying out plantations, it is better to use seeds. A. macrophylla and A. manshuriensis are promising for wider cultivation and use in vertical landscaping.

В условиях потепления климата за период времени 1939-2018 гг. средняя минимальная температура воздуха в Санкт-Петербурге, на основе которой производится дендрологическое районирование и выделение зон устойчивости древесных растений, повысилась на 4,3 C, что можно считать очень значительным повышением. Начиная с 20-летия 1980-2000 г. (-23,3 C) Санкт-Петербург стали относить к более тёплой зоне 6, для которой заметно расширяется возможность культивирования в открытом грунте ассортимент более теплолюбивых деревьев и кустарников. Уже сейчас в парке-дендрарии и в питомнике Ботанического сада Петра Великого, зимуют и даже размножаются из местных семян такие виды деревьев и кустарников, как Acer palmatum Thunb., A. japonicum Thunb., Calycanthus fl oridus L. и др., которые раньше считались непригодными для выращивания в данных условиях. При дальнейшем повышении температуры воздуха Санкт-Петербург может быть отнесен к более тёплой подзоне 6 b, тогда в открытом грунте смогут выращиваться представители новых родов и семейств, которые сейчас отсутствуют в дендрологических коллекциях. In conditions of the warming of the climate during the period 1939-2018 the average minimum temperature (on which USDA Hardiness Zones are determined) at Saint-Petersburg has raised on 4,3 оC which may be considered to be very substantial. Beginning from the 20 years period 1980-2000 (-23,3 оC) Saint-Petersburg steadily has passed from zone 5 into more warm zone 6, and correspondingly the assortment of promising trees and shrubs suitable for cultivation outdoor has been enlarging considerably. Even now there are arboreal species such as Acer palmatum Thunb., A. japonicum Thunb., Calycanthus floridus L. etc., which had been considered to be not suitable for cultivation before but nowadays are quite hardy, and moreover, produce flowers, fruits and are propagated from local seeds. In conditions of further warming of temperature Saint-Petersburg may move into more warm subzone 6 b, when species of new genera and families which now are absent in botanical collections may appear outdoor.

Cercidiphyllum japonicum Siebold et Zucc. начал испытываться в Научно-опытной станции «Отрадное» Ботанического института им. В.Л. Комарова РАН с 1964 г. В условиях Карельского перешейка (Приозерский район Ленинградской области) образует хорошо развитый куст 10,5 м выс. в возрасте 41 год, По сравнению с ранее известными данными размеры его значительно увеличились. Плодоносит с 1989 г., в 2018 г. получено семенное потомство, всхожесть семян составила 6%. В 2019 г. обнаружен самосев, возраста 6-9 лет, который появился, очевидно, после аномально жаркого лета 2010 г. в условиях потепления климата. Сроки прохождения фенофаз сезонного развития соответствуют местному календарю природы, сравнительно зимостоек и не повреждается осенними и весенними заморозками. Вид можно рекомендовать для озеленения Карельского перешейка и продвинуть его культуру дальше к северу. Otradnoje Scientific-Research Station of the V.L. Komarov Botanical Institute of Russian Academy of Sciences was established in 1946. Cercidiphyllum japonicum Siebold et Zucc. began to test here since 1964. In conditions of the Karel Isthmus (Priozersky administrative district of Leningrad region, Russia) it produces the well-developed shrubby plant up to 10,5 m high in the age of 41 years old. Comparing with earlier published data its sizes have considerably enlarged. It produces fruits since 1989. The seed reproduction was obtained in 2018, with germination power 6%. The katsura’s self sowing was found in 2019: several young plants being 6-9 years old. The dates of its stages of phenological rhythm of development are corresponded with local Calendar of Nature. It is not subjected to spring and autumn frosts and is quite winter hardy in conditions of modern climate. The species may be recommended for planting around the Karel Isthmus and to promote its cultivation further up to the North.

Ginkgo biloba L. has been known at Peter the Great Botanic Garden of the Komarov Botanical Institute RAS (Saint-Petersburg, Russia) since 1816. In modern collection it is represented since 1947, in vegetative state. In these conditions, it forms a well-developed tree with a single trunk and a well-developed crown; the best specimens have reached a height of 15.5 m at the age of 74 years old. Compared to previously published data, its size has increased significantly. The dates of phenostages of its seasonal rhythm of development correspond to the local Calendar of Nature; it is not damaged by spring and autumn frosts. The maximum percentage of rooting from cuttings was 88,5 %.The species may be recommended for Saint-Petersburg’s city planting. Earlier there was an opinion that Leningrad (Saint-Petersburg, not Kharkov) is the northern border of Ginkgo cultivation in living form of a tree (Komarova, Zamjatnin, 1990), but nowadays, in the second decade of the XXI century, its distribution may be prolonged further up to the North.

Д. Г. Мельников В. В. Бялт Г. А. Фирсов Новые и редкие виды и гибриды из семейства Lamiaceae во флоре природного парка «Нижнехопёрский» (Волгоградская область) и его окрестностей В результате критического изучения гербарных материалов по семейству Lamiaceae, литературных источников и полевых наблюдений для флоры Нижнего Хопра и Нижнего Поволжья в целом впервые указываются: Ziziphora rotundifolia (Pers.)Melnikov, Ajuga × hybrida Kern., Lycopus × intermedius Hausskn., Prunella × spuria Stapf, Salvia × cernua Czern.ex Des.-Shost., Stachys × ambigua Sm., а также 2 адвентивных вида: