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The article presents new records for five alien species previously unknown from the flora of United Arab Emirates (UAE): Euphorbia cyathophora Murr. (Euphorbiaceae), Samolus valerandi L. (Myrsinaceae), Oldenlandia umbellata L. (Rubiaceae), Cardiospermum halicacabum L. (Sapindaceae), and Corchorus aestuans L. (Malvaceae s. l. / Tiliaceae). All of them have been recorded for the first time from the emirate of Fujairah in eastern part of the UAE. Euphorbia cyathophora, which is rare in the country, was found only in “Green Oasis Nursery” at Al Dibba town, Oldenlandia umbellata– found at the beginning of the seefront at Fujairah City, and they are new for the flora of the Arabian Peninsula. Samolus valerandi was found only in the “Desert Nurseries Group store 1 (palms)” at village Al Bidiya, Corchorus aestuans – in private nursery at Al Dibba town, and Cardiospermum halicacabum was found in the Masafi friday market, they are new for the flora of Fujairah and UAE. Accepted names, synonyms, spatial distribution, habitat preferences, and species taxonomy with remarks on identification and differentiation from the most similar taxa occurring in the study area, as well as the list of localities are presented. The herbarium materials were transferred to the Herbarium of the Komarov Botanical Institute (LE, Saint-Petersburg, Russia), the duplicates – to the Herbarium of Altai State University (ALTB, Barnaul, Russia) and the Scientific Herbarium of Fujairah (FSH, Wadi Wuraya national park, Fujairah, United Arab Emirates).

During floristic research in 2017–2022 in the Emirate of Fujairah in the United Arab Emirates (UAE), the authors discovered new alien species that complement the species composition of the flora of vascular plants in the Emirate and the UAE as a whole. The article presents new records of five alien species previously unknown from the flora of UAE and Fujairah: Gomphrena serrata L. (Amaranthaceae), Portulaca pilosa L., P. grandiflora Hook., P. umbraticolaKunth (Portulacaceae), and Peperomia pellucida (L.) Kunth (Piperaceae). Gomphrena serrata which is rare in the country was found only in one place in the mountainous region of Fujarah, and it is a novelty for the flora of the Arabian Peninsula as a whole, while Portulaca pilosa was observed in several different areas of Fujairah Emirate and is also known for Saudi Arabia, Yemen and Oman. Peperomia pellucida was found only in a single locality in the “Alamarey plant nursery” in Dibba town but in large number of individuals. For every species, synonyms, overall distribution, habitat preferences, affinity and taxonomic remarks as well as the list of localities are given. The herbarium materials were deposited in the Herbarium of the Komarov Botanical Institute (LE, Saint-Petersburg, Russia), duplicates were sent to the Herbarium of Altai State University (ALTB, Barnaul, Russia) and the Scientific Herbarium of Fujairah (FSH, Wadi Wuraya National Park, Fujairah, UAE).

During floristic research in 2017–2020 in the Emirate of Fujairah in the United Arab Emirates (UAE), the authors made new findings of species from family Urticaceae that complement the species composition of the flora of vascular plants in the territory of the emirate and the UAE as a whole. The article presents data on 4 new to the UAE alien ergasiophytes from Urticaceae – Laportea interrupta (L.) Chew. (a weed in the plant nursery in Al Bidiya), Pilea microphylla (L.) Liebm. (a weed in nurseries in Al Dibba and Al Bidiya), Pouzolzia zeylanica (L.) Benn. (a weed in the seaside promenade of city of Al Fujeirah), and Pilea microphylla and Pouzolzia zeylanica also for Arabia in general. A preliminary assessment of the species diversity of family Urticaceae in the Arabian Peninsula is also given. Taking into account new records, 7 species from 6 genera belonging to this family have been identified in the UAE. The herbarium materials were transferred to the Herbarium of the Komarov Botanical Institute (LE, Saint-Petersburg, Russia), the duplicates – to the Herbarium of Altai State University (ALTB, Barnaul, Russia) and the Scientific Herbarium of Fujairah (FSH, Wadi Wuraya, Fujairah, United Arab Emirates).

During floristic research in 2017–2020 in the Emirate of Fujairah in the United Arab Emirates (UAE), we made new findings that complement the species composition of the flora of vascular plants in the territory of the Emirate and the UAE as a whole. The article provides data on 7 new ergasiophytes and ergasiophygophytes, alien to the Emirate of Fujairah: Asystasia gangetica T. Andersson (Acanthaceae) found growing wild in Dibba, A. gangetica subsp. micrantha (Nees) Y. F. Deng et N. H. Xia (Acanthaceae), as a weed in the nurseries of Dibba, Rul Dadna and Al Bidiya, Centella asiatica (L.) Urb. (Apiaceae), as a weed in Dibba town, Basella alba L. (Basellaceae) cultivated and becomes wild in Dibba town, Citrus ×limon (L.) Osbeck (Rutaceae) cultivated and often found growing wild in Dibba, the village of Sharm and other settlements of the Emirate, Murraya koenigii (L.) Spreng. cultivated and becomes wild in Dibba, Rul Dadna, Al Bidiya and other places, and M. paniculata (L.) Jack (Rutaceae) cultivated and becomes wild in plant nurseries in Dibba and Al Bidiya. Asystasia gangetica, A. micrantha, and Centella asiatica are new alien species for Fujairah Emirate and the UAE, and Basella nigra, Murraya koenigii and M. paniculata are new also for Arabia as a whole. A brief history of the study of the flora of the UAE and a preliminary summary of its species diversity are also given.