Within the UAE, this species has been recorded from Al Ain and Sharjah (Jongbloed et al. 2003), in addition to two other scattered localities within the northeast of the country (Sharjah Seed Bank and Herbarium pers. comm. 2019). The estimated EOO of this species is 3,992 km² and it is considered to occur at four locations, based on the most important threat of grazing. Globally, the native range of this species spans across the Sahara, Kenya and India, including the Arabian Peninsula (Board of Trustees, RBG Kew 2019).

Within the UAE, it is widespread across the desert between Ras al Khaimah to Abu Dhabi (Jongbloed et al. 2003). Globally, this species is native to Africa, tropical Asia and temperate Asia (Board of Trustees, RBG Kew 2019).

Plocama aucheri is known to occur in the Hajar Mountains, however it prefers low altitudes, and is considered as rare above c. 700 m and absent above c. 1,100 m (Feulner 2011). It is also recorded from the foot of Jebel Hafeet, where it is thought to be frequent (Perry 2008). Globally, this species is found from the Arabian Peninsula to Pakistan (Board of Trustees, RBG Kew 2019).

This species was first recorded for the the UAE from the Hatta region (as 'Pimipinella schweinfurthii'; Böer and Chaudhary 1999) but does not appear since in the available literature for the country, other than a mention in Jongbloed et al. (2003). Globally, this species occurs in Qatar, the UAE and Oman according to Plants of the World online (Board of Trustees, RBG Kew 2019). It is considered to be extinct in Egypt (Board of Trustees, RBG Kew 2019).

The species was recorded for the UAE (Hatta area) by Böer and Chaudhary (1999). RBG Edinburgh Herbarium holds two specimens of Pimpinella cf. puberula from the UAE; 1. <a href=""http://data.rbge.org.uk/herb/E00648740"">Fujairah Emirate</a> (date palm oasis beside Wadi Seder, between Khatt and Dibba, in an area of steep rocky hills and wadis, however this locality requires confirmation), collected by R.A. Western, 1982; and 2. <a href=""http://data.rbge.org.uk/herb/E00648741"">Wadi al Fay, Hatta</a>, 1984: although the herbarium record cites this for the UAE, the coordinates given (24'° 42' N, 56'° 11' E) are in Oman. The species was also recorded by Karim and Fawzi (2007) from R'as al Khaimah, Khor Fakkan, and from Al Ain. The species has a disjunct temperate Asian distribution that perhaps requires confirmation; known from the Arabian Peninsula and from Central Asia (western China (Xinjiang, Hami), Afghanistan, Kazakhstan, Kyrgyzstan, Pakistan, southern Russia, Tajikistan, Turkmenistan, and Uzbekistan) (Board of Trustees, RBG Kew 2019). The species is also recorded from Iran.

The species is widespread in the southern Hajar Mountains' wadis (Jongbloed et al. 2003) in the UAE but not confirmed for the Ru'us al-Jibal (Feulner 2011). The global range of this species is Asia-Temperate; from Turkey, Lebanon-Syria, the Arabian Peninsula (Saudi Arabia and the UAE) and Gulf States, and east to Iran (Board of Trustees, RBG Kew 2019).

This species is known from the mountains of the eastern UAE, from the Ru'us al-Jibal (occasional) in the north, to the Hajar Mountains (the 'Olive Highlands') in the south, where it is known to favour high elevations, persisting at altitudes above 700 m (Feulner 2014). It is known from a single anomalous low-altitude record in Wadi Wurayah National Park (Wadi Ghayl; Feulner 2016). Globally, this species is known from northeast Africa to Sudan (Board of Trustees, RBG Kew 2019).

Within the UAE, this species has only been recorded from a single location: coastal sands close to Khor Fakkan, by G.R. Feulner (Jongbloed et al. 2003, MEW 2010). The estimated extent of occurrence of this species is 4 km². Despite the locality undergoing change, the species persists (G.R. Feulner pers. comm. 2019). Globally, the native range of the species spans from Tanzania to Egypt and the Arabian Peninsula, to Pakistan and India (Board of Trustees, RBG Kew 2019).

Jongbloed et al. (2003) recorded this species from the hills between Masafi and Dibba in the northeast of the UAE, in addition to Wadi Diftah and the Ru'us al-Jibal. However, the identity of records require confirmation, and pending further study, we consider there to be one species in the UAE, P. decaisnei. Globally, this species is native to Europe, Africa, temperate Asia and the western Himalayas (Board of Trustees, RBG Kew 2019).

The species is known from lower altitude hillsides from Masafi and Dibba (MEW 2010). It is described as being most common at high altitudes in the Ru'us al-Jibal, and can be found in scattered, usually relatively mesic, locations throughout this area (MEW 2010; Feulner 2011, 2016; G.R. Feulner pers. comm. 2020). Its native range is from the east of Egypt to Pakistan (Board of Trustees, RBG Kew 2019).