Ten species of vascular plants newly recorded in Uzbekistan are presented. The first record of Anthemis ruthenica from the northern side of the Alay range is confirmed, and the species was found for the second time in a neighborhood of Tashkent as an alien. Carduus arabicus as a native plant in Central Asia is recorded for the first time from Western Pamir-Alay. Chondrilla brevirostris, C. macrocarpa, and C. phaeocephala are from the desert and adyrs zones. Crinitaria tatarica and Crepis mira collected from Western Tien-Shan are presented, Olgaea baldschuanica first recorded on the Babatag range of mountains as a subendemic species and Erigeron andryaloides from the Hissar range are reported here as among the flora of Uzbekistan. The former Centaurea apiculata Ledeb. was accepted as a synonym of C. scabiosa L. subsp. apiculata. All records were collected in different habitats of Uzbekistan. Taxonomic remarks, pictures and distribution maps for these species are provided.
Cousinia knorringiae Bornm. (Asteraceae) belongs to C. sect. Subappendiculatae Tscherneva, a group of the species-rich and taxonomically difficult genus Cousinia Cass. This species is narrowly distributed in the Western Tian-Shan and has been known as endemic to Kyrgyzstan. It inhabits bare rocks and screes at elevations of 1200–1500 m above sea level. This species is of conservation interest because of its small population size and limited distribution.
Cousinia knorringiae is reported for the first time from eastern Uzbekistan on the basis of specimens collected on Ungur-Tepa Mt., a south-western outlier of the Bozbu-Too Mts. (Western Tian-Shan). The conservation status of the species is assessed as Endangered (EN), based on criterion D (estimated population size 200-250 mature individuals), according to the IUCN Red List Categories and Criteria (version 3.1). A new distribution map and a line drawing for C. knorringiae are provided and its type locality is clarified. The new knowledge suggests that the species is endemic to the East Fergana botanical hotspot, which includes a transborder territory shared between Kyrgyzstan and Uzbekistan and should, therefore, be subjected to international conservation measures. The southern extension of Ungur-Tepa Mt. harbours important plant species, which cannot be found elsewhere in Uzbekistan and may, therefore, be proposed for legal protection.
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