In this study, we critically revised and updated the checklist of native vascular plants of Mongolia. The checklist comprises 3,041 native vascular plant taxa (2,835 species and 206 infraspecific species) from 653 genera and 111 families, including 7 lycophytes, 41 ferns, 21 gymnosperms, and 2,972 angiosperms. In the angiosperms, we identified the 14 families with the greatest species richness, ranging from 50 to 456 taxa. Species endemism is also noted here; 102 taxa are endemic to Mongolia, and 275 taxa are sub-endemic that co-occur in adjacent countries. Since 2014, a total of 14 taxa have been described new to science based on morphological evidences. Moreover, five genera and 74 taxa were newly added to the flora of Mongolia. Based on our critical revisions, names of three families, 21 genera, and 230 species have been changed in comparison to the previous checklist, “Conspectus of the vascular plants of Mongolia” (2014).

Participatory citizen science is expanding, with iNaturalist emerging as one of the most widely used platforms globally. However, its application in research is often anecdotal. To evaluate the impact of how iNaturalist is contributing to biodiversity and conservation research, we conducted a systematic review of iNaturalist data use and compared our findings with Global Biodiversity Information Facility literature citing iNaturalist. We found that the use of iNaturalist data in peer-reviewed research has grown tenfold in the last 5 years, matching the growing increase in iNaturalist observations. Geographic and taxonomic representation in the literature generally aligns with data availability, with iNaturalist data derived from 128 countries and 638 taxonomic families being used in peer-reviewed literature. Currently, data from iNaturalist are primarily used for species distribution models and range dynamics. We highlight emerging trends in the use of iNaturalist data in the literature lending to its future potential across biodiversity sciences.

The aim of the present study is to update the checklist of vascular plants endemic to Mongolia using previous checklists, publications, herbarium collections, and field observations. The revised checklist includes 102 endemic taxa (95 species, five subspecies, and two nothospecies) from 43 genera and 19 families. The majority of endemic taxa were distributed in western and central Mongolia, and high endemic species richness was identified in four phytogeographical regions, namely Mongolian Altai, Khangai, Dzungarian Gobi, and Gobi Altai, which harbor 49, 27, 20, and 16 endemic taxa, respectively. For each endemic taxon, we compiled information about growth form, conservation status (if already assessed), phytogeographical distribution, and voucher specimens. Data on each taxon’s type specimen were also collected, and the majority of the type specimens were accessioned at the LE (58 taxa), MW (20 taxa), and UBA (7 taxa) herbaria.

Allium is a complicated genus that includes approximately 1000 species. Although its morphology is well studied, the taxonomic importance of many morphological traits, including floral traits, are poorly understood. Here, we examined and measured the floral characteristics of 87 accessions of 74 Allium taxa (belonging to 30 sections and nine subgenera) from Central to Eastern Asian countries. We then examined the taxonomic relationships between select flower characteristics and a phylogenetic tree based on ITS sequences. Our results confirm that floral morphology provides key taxonomic information to assess species delimitation in Allium. We found that perianth color is an important characteristic within the subg. Melanocrommyum, Polyprason, and Reticulatobulbosa. In subg. Allium, Cepa, and Rhizirideum, significant characteristics include ovary shape, perianth shape, and inner tepal apex. For species in subg. Angunium, the key taxonomic character is ovule number (only one ovule in per locule). In the subg. Allium, Cepa, Polyprason, and Reticulatobulbosa, which belong to the third evolutionary line of Allium, hood-like appendages occur in the ovary, although these do not occur in subg. Rhizirideum. Our results also indicated that the flower morphology of several species in some sections are not clearly distinguished, e.g., sect. Sacculiferum (subg. Cepa) and sect. Tenuissima (subg. Rhizirideum). This study provides detailed photographs and descriptions of floral characteristics and information on general distributions, habitats, and phenology of the studied taxa.

Orchidaceae is a diverse, globally important plant family with high conservation assessment and prioritization requirements. The checklist of Orchidaceae in Mongolia was updated based on herbarium materials, literature, and field observations. Mongolian orchids were revised as comprising 26 taxa belonging to 14 genera with major updates were conducted on Herminium and Epipactis. In particular, H. alaschanicum, previously noted in the Alashan Gobi region, was added to the flora of Mongolia based on literature and type specimens. Epipactis helleborine and E. palustris were excluded from the Mongolian flora owing to the absence of herbarium specimens and wild collection from Mongolia. Assessment of all orchid species at the national level resulted in 1, 4, 7, 11, and 2 species as critically endangered (CR), endangered (EN), vulnerable (VU), near threatened (NT), and data deficient (DD), respectively, according to IUCN criteria. Species richness and conservation gap analyses of 970 georeferenced orchid records based on 0.5° × 0.5° grid cells across 16 phytogeographical regions of Mongolia, showed that four phytogeographical regions, Khangai, Khuvgul, Khentii and Mongolian Dauria, have a high number of orchids. Regrettably, most orchid-rich locations in Mongolia are not fully within protected areas, highlighting the need for protection management updates. Based on herbarium collections, we prepared grid distribution maps of the 26 taxa using 40 × 40 km² grids. Photographs of 18 taxa taken during fieldwork were included, providing valuable information on species morphology and typical habitat.

Societal Impact Statement: Citizen science – collaboration between scientists and the public – has the potential to advance biodiversity monitoring. Using a case study from Mongolia, called the Flora of Mongolia project in iNaturalist, we illustrate how crowd‐sourced biodiversity data fills gaps of plant diversity in Mongolia. Over 52,200 observations covering 2,241 species of vascular plants (ca. 3,050 species) were observed by 665 participants between 2019 and 2023, showcasing the vast potential for rapid biodiversity inventories. This case study, from an under‐resourced region, illustrates the potential role of citizen science, and iNaturalist, in future biodiversity monitoring efforts. Summary: At a time of alarming biodiversity loss, biodiversity monitoring is crucial. Yet, funding for such monitoring is difficult to attain, leading to data gaps of baseline biodiversity information in regions of the world that are often the most threatened. In Mongolia, there are limited resources for finding wild photos and distribution points of vascular plant species. Therefore, we established the Flora of Mongolia project in iNaturalist in January 2019 to fill the gap of quantifying the country's plant diversity. Over the course of five years, 665 participants have contributed 52,286 observations belonging to 2,241 species. To date, participants have already observed 69% of the estimated total vascular plant species (ca. 3,050 species) in Mongolia including numerous threatened and endemic species. The total number of observations in iNaturalist is now higher than both herbarium records from GBIF and FloraGREIF for Mongolia, showcasing the potential of crowd‐sourcing data. The majority of species and observation numbers were observed in the western and central parts of Mongolia. This iNaturalist project is significantly expanding the capacity for data collection and analysis of vascular plants, highlighting the important role that customized iNaturalist projects can have in biodiversity data generation. As citizen science data collections continue to grow, we can expect them to play a significant role in further improving our knowledge of plant diversity, monitoring invasive species, and quantifying the impacts of climate change on rare and threatened plants.