Keywords
Gagea
ITS phylogeny
Kuljuktau Mountains
morphology
sect. Plecostigma
taxonomy
Western Pamir-Altay
How to Cite
Abstract
The genus Gagea represents one of the most species-rich groups of monocotyledonous plants in Central Asia and continues to yield new taxa through integrative taxonomic studies. During investigations of herbarium collections and field surveys in Uzbekistan, a previously undescribed species belonging to Gagea sect. Plecostigma was discovered. Here, we describe and illustrate Gagea kuljuktauensis Levichev based on morphological observations and molecular phylogenetic evidence derived from nuclear ribosomal ITS sequences. The new species is characterized by two filiform basal leaves exceeding the inflorescence, pubescent stems 10–25 cm tall, 2–3-flowered inflorescences, and bright yellow perianth segments with violet apices. It differs from its closest relatives, G. afghanica and G. olgae, by a unique combination of vegetative and reproductive characters, including leaf number, stem indumentum, flower morphology, and fruit size. Phylogenetic analyses based on ITS sequences placed the new species within Gagea sect. Plecostigma and recovered it as the sister taxon of G. afghanica with moderate bootstrap support. Gagea kuljuktauensis is currently known from four localities in Uzbekistan, including the Kuljuktau Mountains in the southwestern Kyzylkum Desert and several sites in the western Pamir-Alay. The species inhabits dry stony slopes, foothills, and low mountain habitats at elevations of 470–1300 m a.s.l. The discovery of this species highlights the importance of integrating morphological, anatomical, and molecular evidence for resolving species diversity within Gagea and underscores the need for continued taxonomic exploration in the floristically rich regions of Central Asia.
References
Ali SI, Levichev IG (2006) Gagea. In: Ali SI, Qaiser M (Eds) Flora of Pakistan 215. University of Karachi & Missouri Botanical Garden, 1–81.
iNaturalist contributors, iNaturalist (2025) iNaturalist Research-grade Observations. https://doi.org/10.15468/ab3s5x (Accessed 29 December 2025)
Kurbaniyazova GT, Levichev IG (2022) History of the study of the genus Gagea Salisb. in the flora of Uzbekistan. Andijan University Scientific Bulletin. Series: Biological Research 4(64): 109–115.
Kurbaniyazova G, Alieva K, Karimov F (2024) Genus Gagea Salisb. of the Southwestern Pamir-Alai within Uzbekistan. Version 1.12. Institute of Botany, Academy of Sciences of the Republic of Uzbekistan. https://doi.org/10.15468/tsryfw (Accessed 29 December 2025).
Letunic I, Bork P (2021) Interactive Tree of Life (iTOL) v5: an online tool for phylogenetic tree display and annotation. Nucleic Acids Research 49(W1): W293–W296. https://doi.org/10.1093/nar/gkab301
Letunic I, Bork P (2024) Interactive Tree of Life (iTOL) v6: recent updates to the phylogenetic tree display and annotation tool. Nucleic Acids Research 52(W1): W78–W82. https://doi.org/10.1093/nar/gkae268
Levichev IG (1996) The genus Gagea Salisb. of the Western Tian Shan. PhD Dissertation. Komarov Botanical Institute, Russian Academy of Sciences, St. Petersburg, 183 pp. [In Russian]
Levichev IG (2008) Historia Gagearum. Komarov Botanical Institute, Russian Academy of Sciences. Available at: http://www.binran.ru/resources/archive/gagearum/
Levichev IG, Karimov FI, Kurbaniyazova GT (2025) A new species of Gagea (Liliaceae) from the Ferghana Valley (Uzbekistan). Turczaninowia 28(1): 95–101. https://doi.org/10.14258/turczaninowia.28.1.11 [In Russian]
Peterson A, Levichev IG, Peterson J (2008) Systematics of Gagea and Lloydia (Liliaceae) and infrageneric classification of Gagea based on molecular and morphological data. Molecular Phylogenetics and Evolution 46(2): 446–465. https://doi.org/10.1016/j.ympev.2007.11.016
POWO (2025) Plants of the World Online. Kew: Facilitated by the Royal Botanic Gardens, Kew. https://powo.science.kew.org/ (Accessed 29 December 2025).
Ridgway KP, Duck JM, Young JPW (2003) Identification of roots from grass swards using PCR-RFLP and FFLP of the plastid trnL (UAA) intron. BMC Ecology 3: 8. https://doi.org/10.1186/1472-6785-3-8
Stamatakis A (2014) RAxML version 8: a tool for phylogenetic analysis and post-analysis of large phylogenies. Bioinformatics 30(9): 1312–1313. https://doi.org/10.1093/bioinformatics/btu033
Tamura K, Stecher G, Kumar S (2021) MEGA11: Molecular Evolutionary Genetics Analysis version 11. Molecular Biology and Evolution 38(7): 3022–3027. https://doi.org/10.1093/molbev/msab120
Tojibaev K, Beshko N, Mirzalieva D, Khassanov F (2022) Type Collection of the National Herbarium of Uzbekistan (TASH). Institute of Botany, Academy of Sciences of the Republic of Uzbekistan. https://doi.org/10.15468/sb2srm (Accessed 29 December 2025).
Turginov OT, Levichev IG, Kurbaniyazova GT, Karimov FI, Yang L, Li WJ (2025) A new white-flowered species of Gagea (Liliaceae) from the Fergana Valley, Uzbekistan and Kyrgyzstan. PhytoKeys 260: 139. https://doi.org/10.3897/phytokeys.260.151373
White TJ, Bruns T, Lee S, Taylor J (1990) Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics. In: Innis MA, Gelfand DH, Sninsky JJ, White TJ (Eds) PCR Protocols: A Guide to Methods and Applications. Academic Press, New York, 315–322. https://doi.org/10.1002/njb.04813
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