Parrya tojibaevii, a morphologically distinct species related to the taxa previously assigned to the genus Pseudoclausia, recognized herein as a section, is described and illustrated. The novelty, known from a few collections, is confined to a small and highly disturbed area around the confluence of Chatkal River with Charvak Reservoir (Western Tian Shan, Uzbekistan) and is morphologically closest to P. gracillima and P. mollissima. The new species can be assessed as critically endangered due to its very narrow and obviously shrinking range and habitat, an easy accessibility of known localities, and a growing threat from the construction of hydroelectric power station, roads and resorts, and also from recreation and grazing.

Endemic species usually have higher risk of extinction than widespread species and therefore for endemics negative effects of climate change can be especially dramatic. The Nuratau Mountains, located in Uzbekistan, are rich in endemic species and are a part of the Mountains of Central Asia Global Biodiversity Hotspot and one of Key Biodiversity Areas. To understand the consequences of climate change for a group of endemic plant species found in this region, we conducted species distribution modelling (SDM) and produced species maps of habitat suitability, as well as maps of predicted endemic species richness under current and expected future climatic conditions. Based the obtained information, we assessed: i) how well the existing protected area in the region (Nuratau Nature Reserve) protects the local endemics and ii) what needs to be done to preserve these species in the face of expected future warming. Among the 27 species studied, 14 appear to be the true narrow endemics as their predicted range is largely or entirely limited to the Nuratau Mountains. The remaining species have a wide predicted range, of which the Nuratau Mountains are only a small part. Only seven species will have suitable habitat within the Nuratau Mountains and only five of them will have suitable habitat in the protected territory of the Nuratau Nature Reserve. For six species, there will be no suitable area throughout the study area. Surprisingly, 13 species will have a suitable habitat in the Kugitang Range, where the Surkhan Nature Reserve is located. We propose as the most appropriate climate change adaptation strategy for these Nuratau endemics to artificially increase their dispersal capacity via in situ

The determination of nucleotide sequences in DNA, sequencing of chloroplast genomes techniques, based on the use of combinations a significant number genetic markers, as well as the nuclear genome are widely use for inventory of rare plant species, ecological monitoring and species diversity assessment. The results of our molecular analysis are used to examine the taxonomic identity and phylogenetic relationship of the studied Iris species collected in Uzbekistan. The genotyping of three-four functional loci of nrDNA and cpDNA was performed for efficient species identification and confident results. The nuclear ITS gene sequences and chloroplast trnL-trnF, rbcL, matK gene sequences were obtained from 10 Iris species and have proven to be useful as molecular markers for species identification. Sequences of cpDNA regions, have been used to assess interspecific relationships of Iris. Hierarchical clustering were constructed using 13 consensus matK gene sequences. In this study, we consider the possibility of successful application the DNA barcoding as a tool for assessment of wild Iris species diversity in Uzbekistan.

В статье приведены данные о находках 4 видов из рода Gagea, обнаруженных в узбекистанской части Западного Памиро-Алая в результате полевых исследований 2017–2022 гг. и ревизии гербарных образцов, хранящихся в Национальном гербарии Узбекистана (TASH). Из них Gagea pakistanica и G. wallichii – новые для флоры Узбекистана; G. filiformis – новый для Западно-Гиссарского ботанико-географического округа; G. takhtajanii впервые приводится для хребта Бабатаг.

The study of the ontogenetic structure of the coenotic populations of vulnerable, endemic, and rare plant species makes it possible to assess their state under the conditions of anthropogenic transformation of ecosystems and develop the scientific basis for their protection. Central Asia is one of the centers of origin and species diversity of the genus Tulipa L. In the flora of the Republic of Uzbekistan, there are 34 species of tulips, of which 19 species (55.88%) are endangered due to the collection of flowers and bulbs and overgrazing and habitat destruction. These are listed in the national Red Book. This article is devoted to the assessment of the current state of 13 coenotic populations of five rare and endemic species of the genus Tulipa (T. borszczowii, T. butkovii, T. dubia, T. greigii, T. korolkowii), growing in the Tashkent region of Uzbekistan in areas with different environmental regimes and levels of anthropogenic pressure. It has been established that eight studied cenopopulations are normal and full-membered; five populations are incomplete, they lack senile individuals, which is a biological feature of the genus Tulipa. Six cenopopulations belong to the left-sided type, their ontogenetic spectrum coincides with the characteristic spectrum of the genus Tulipa; four coenopopulations have a centered type of spectrum, while three are bimodal. The low proportion of juveniles in some of the cenopopulations studied is due to the influence of overgrazing, as well as high competition with other species in the community. It is recommended that a rare endemic of the Central Asian deserts be included in the next edition of the Red Book of Uzbekistan Tulipa borszczowii and national endemic, narrow-local endemic of the Chatkal ridge Tulipa butkovii. It is recommended to create a protected area (zakaznik or natural monument) to preserve the relic sandy massif Dalverzinskie sands in the Tashkent region.

Biomorphological features of 14 rare Tulipa species listed in the Red Book of the Republic of Uzbekistan (Tulipa affinis, T. carinata, T. ferganica, T. fosteriana, T. greigii, T. ingens, T. kaufmanniana, T. korolkowii, T. lanata, T. micheliana, T. scharipovii, T. tubergeniana, T. uzbekistanica and T. vvedenskyi) were studied under ex situ conditions in the Tashkent Botanical Garden. It has been found, that all studied species successfully grow and bear fruits ex situ. All 14 species are able to autogamy; even solitary generative specimens regularly produce seeds. This feature significantly facilitates the further breeding of rare species of tulips. Considering the heterospermy and irregular quality of seedlings, the most rapidly developing individuals should be selected for cultivation and reintroduction.