This species has been recorded widely in the north-east of the UAE, with a distribution in the Hajar Mountains and the western foothills and gravel plains (Jongbloed et al. 2003). The species has also been recorded in the Ru'us al-Jibal (Feulner 2011). Feulner (2016) considered it likely to be present in Wadi Hiluw. Judas (2016) recorded the species from Wadi Wurayah National Park. The species has also been reported from Taweela, as well as the coastal dunes from Umm al-Quwain to Ra's al-Khaimah, which suggests this species is continuously distributed along the coastal strip from Abu Dhabi Island to Ra's al-Khaimah (Brown et al. 2007). It has also been recorded from Jebel Hafeet (Sakkir and Brown 2014).Globally, the species occurs from the Macaronesian Islands, across southern Spain, and through northern Africa to the Middle East, India and Pakistan (Board of Trustees, RBG Kew 2018). It has been introduced to southern Africa and to Australia.

In the UAE, this species has been recorded once in the Diftah Oasis in the Hajar Mountains (Jongbloed et al. 2003). It has also been recorded from the Musandam Peninsula in Oman (Feulner 2011). Globally Rostraria cristata occurs in North Africa, Southern Europe, France, the Middle East, Central Asia and India. It has been introduced the parts of North America, South America, South Africa, Japan and Australia (Board of Trustees, RBG Kew 2018).

This species has been recorded from a single locality in the UAE, in the northern Ru'us al-Jibal (Jebel Rahabah) at around 1,250 m elevation (Feulner 2011). Globally, the native range of this species spans across Europe and Macaronesia to Cape Province, in addition to China and the Himalayas (Board of Trustees, RBG Kew 2019). It has been very widely introduced.

This species appears to occur in scattered localities throughout the UAE (Jongbloed et al. 2003). The species is a significant agricultural weed (CABI 2019) and is listed as an introduced landscape plant by MoCCaE, and its origin in the UAE perhaps requires confirmation. The species is not cited for the UAE by Al Mehairbi et al. (2019). Globally, the native range of this species spans from Macaronesia and the Mediterranean to the Himalayas and Eritrea (Board of Trustees, RBG Kew 2019), and it has been very widely introduced.

The distribution of this species in the UAE is not well understood. Feulner (2016) records the species from the Wadi Wurayah National Park buffer zone in the upper parts of Wadi Siji and Feulner (2014) records the species from northeast facing cliffs along the summit ridge of Jebel Qitab, from Jebel Masafi. It is known from a single site in the Ru'us al-Jibal on a cliff-face close to a spring ('Ayn as-Sih in Oman) at 470 m elevation (Feulner 2011). The species also occurs at cultivated sites elsewhere in the UAE. Globally, the native range of this species spans across northern Africa to Caucasus and to the Indian subcontinent (Board of Trustees, RBG Kew 2019). Although Plants of the World Online lists the UAE as a native country of occurrence, there is very little available information on this species within the country, including detailed distribution data.

This species occurs widely in the central and north-eastern UAE (Jongbloed et al. 2003), and it is also present in the Wadi Wurayah National Park (Feulner 2016), in wadi beds in the 'Olive Highlands' (Feulner 2014), and the coastal white sands at Taweela, Abu Dhabi (Brown et al. 2007). Globally, this species is distributed across North Africa, the Middle East, throughout the Arabian Peninsula, Pakistan and India (Board of Trustees, RBG Kew 2018).

In the UAE, Panicum turgidum is widespread and occurs in nearly all of the country. It is rarer in the mountains (Jongbloed et al. 2003) but may occur on some islands (e.g. Abu Dhabi Island; Western 1983). Al Meharibi et al. (2019) consider the species to be absent from Hajar Mountains and the east coast, and also from coastal areas; they comment that this species has undergone significant declines as a result of habitat loss and overgrazing. Globally, Panicum turgidum occurs in North Africa, the Middle East, Pakistan and India (Board of Trustees, RBG Kew 2018).

The species has been recorded from Al Ain (Dubai; Karim 1993) and from Al Dhaid (Sharjah) in the UAE. Globally, the native range of this species spans across Socotra, the Arabian Peninsula, Turkey and on to China and the western Himalayas (Board of Trustees, RBG Kew 2019). Although Plants of the World Online lists the UAE as a native country of occurrence for this species, there seems to be little available information on this plant within the UAE, and Kameswara Rao (2013) lists only Saudi Arabia for the Arabian Peninsula.

This species is common and widespread in low dunes of the eastern Emirates in the UAE (Jongbloed et al. 2003, Al Meharibi et al. 2019). It is generally absent from coastal areas. Outlying records include from Jebel Dhanna (in the far west of the UAE), east of Abu Dhabi, the base of Jebel Hafeet (Brown et al. 2007), and Wadi Al Ain (Mousa and Fawzi 2009). The species is present in the Hajar Mountains (wadis, lower slopes, foothills and alluvial plains; Feulner 2011). Al Meharibi et al. (2019) show a more restricted distribution in inland coastal sand sheets from Abu Dhabi to the northern Emirates. The species is scattered on near-coastal sands in western Abu Dhabi Emirate, rare on near-coastal sands elsewhere, probably due to grazing pressure; it is most often now seen by roads (e.g. Al-Ain-“Dubai road) where livestock can't get at it. The species is also common on limestone outcrops (Jebel Nazwa-“very common locally, Jebel Hafeet, some small patches in the middle of the desert) and in parts of the Hajar Mountains (G. Brown pers. comm. 2019).The native range of this species is from the western Sahara, across Africa to the Arabian Peninsula, to northwest India (Board of Trustees, RBG Kew 2018).

This species has been recorded from the Ru'us al-Jibal from c.1,200-1,350 m asl (Feulner 2011, Al Mehairbi et al. 2019). Jongbloed et al. (2003) shows a record from across the border in Oman, and it has also been found from c.800 m there by G.R. Feulner (2011). The species is native range is from Macaronesia, circum-Mediterranean to Ethiopia, through the Arabian Peninsula, to northern India (Board of Trustees, RBG Kew 2018).